Pittsburgh in the context of Carnegie Mellon School of Computer Science

Presbyterianism (pres-bə-TE-ree-a-nizm) is a historically Reformed Protestant tradition named after its form of church government by representative assemblies of elders, known as "presbyters". Though other Reformed churches are structurally similar, the word Presbyterian is applied to churches that trace their roots to the Church of Scotland or to English Dissenter groups that were formed during the English Civil War, 1642 to 1651.

Presbyterian theology typically emphasises the sovereignty of God, the authority of the Scriptures, and the necessity of grace through faith in Christ. Scotland ensured Presbyterian church government in the 1707 Acts of Union, which created the Kingdom of Great Britain. In fact, most Presbyterians in England have a Scottish connection. The Presbyterian denomination was also taken to North America, Australia, and New Zealand, mostly by Scots and Scots-Irish immigrants. Scotland's Presbyterian denominations hold to the Reformed theology of John Calvin and his immediate successors, although there is a range of theological views within contemporary Presbyterianism. Local congregations of churches that use Presbyterian polity are governed by sessions made up of representatives of the congregation (elders), a conciliar approach as with other levels of decision-making (presbytery, synod, and general assembly). There are roughly 75 million Presbyterians in the world.

The London cast of Dippy is a plaster cast replica of the fossilised bones of a Diplodocus carnegii skeleton, the original of which – also known as Dippy – is on display at Pittsburgh's Carnegie Museum of Natural History. The 26-metre (85 ft) long cast was displayed between 1905 and 2017 in the Natural History Museum in London, becoming an iconic representation of the museum. It began a national tour of British museums in February 2018. Dippy returned to London in June 2022, and then moved to Coventry as a long-term loan to the Herbert Art Gallery and Museum in 2023.

The Ohio River (Seneca: Ohi:yo') is a 981-mile-long (1,579 km) river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its mouth on the Mississippi River in Cairo, Illinois. It is the third largest river by discharge volume in the United States and the largest tributary by volume of the Mississippi River. It is also the sixth oldest river on the North American continent. The river flows through or along the border of six states, and its drainage basin includes parts of 14 states. Through its largest tributary, the Tennessee River, the basin includes several states of the southeastern United States. It is the source of drinking water for five million people.

The river became a primary transportation route for pioneers during the westward expansion of the early U.S. The lower Ohio River just below Louisville was obstructed by rapids known as the Falls of the Ohio where the elevation falls 26 feet (7.9 m) in 2 miles (3.2 km) restricting larger commercial navigation, although in the 18th and early 19th century its three deepest channels could be traversed by a wide variety of craft then in use. In 1830, the Louisville and Portland Canal (now the McAlpine Locks and Dam) bypassed the rapids, allowing even larger commercial and modern navigation from the Forks of the Ohio at Pittsburgh to the Port of New Orleans at the mouth of the Mississippi on the Gulf of Mexico. Since the "canalization" of the river in 1929, the Ohio has not been a natural free-flowing river; today, it is divided into 21 discrete pools or reservoirs by 20 locks and dams for navigation and power generation.

The University of Pittsburgh (Pitt) is a state-related research university in Pittsburgh, Pennsylvania, United States. The university is composed of seventeen undergraduate and graduate schools and colleges at its urban Pittsburgh campus, home to the university's central administration and over 31,000 undergraduate and graduate students. The 132-acre Pittsburgh campus includes various historic buildings that are part of the Schenley Farms Historic District, most notably its 42-story Gothic revival centerpiece, the Cathedral of Learning. Pitt is a member of the Association of American Universities and is classified among "R1: Doctoral Universities – Very high research activity".

Pitt traces its roots to the Pittsburgh Academy founded by Hugh Henry Brackenridge in 1787. While the city was still on the edge of the American frontier at the time, Pittsburgh's rapid growth meant that a proper university was soon needed, and Pitt's charter was altered in 1819 to confer university status on it as the Western University of Pennsylvania. After surviving two fires and several relocations, the university moved to its current location in Pittsburgh's Oakland neighborhood, and by act of the state legislature was renamed the University of Pittsburgh in 1908. Pitt was a private institution until 1966, when it became part of the Commonwealth System of Higher Education.

Pennsylvania, officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio and the Ohio River to its west, Lake Erie and New York to its north, the Delaware River and New Jersey to its east, and the Canadian province of Ontario to its northwest via Lake Erie. Pennsylvania's most populous city is Philadelphia. The state capital is Harrisburg. Among all states, Pennsylvania is the fifth-most populous with over 13 million residents as of the 2020 United States census, the ninth-highest by population density, and the 33rd-largest by land area. The largest metropolitan statistical area is the southeastern Philadelphia metropolitan area, centered on Philadelphia, the state's most populous and nation's sixth-most populous city. The second-largest metropolitan area, Greater Pittsburgh, is centered in and around Pittsburgh, the state's second-largest city.

Pennsylvania was founded in 1681 through a royal land grant to William Penn, the son of the state's namesake. Before that, between 1638 and 1655, a southeast portion of the state was part of New Sweden, a Swedish colony. Established as a haven for religious and political tolerance, the colonial-era Province of Pennsylvania was known for its relatively peaceful relations with native tribes, innovative government system, and religious pluralism. Pennsylvania played a vital and historic role in the American Revolution and the ultimately successful quest for independence from the British Empire, hosting the First and Second Continental Congress in Philadelphia, the latter of which formed the Continental Army commanded by George Washington in 1775, during the American Revolutionary War, unanimously adopted the Declaration of Independence the following year. On December 12, 1787, Pennsylvania was the second state to ratify the U.S. Constitution, right after Delaware.

The American Bridge Company is a heavy/civil construction firm that specializes in building and renovating bridges and other large, complex structures. Founded in 1900, the company is headquartered in Coraopolis, Pennsylvania, a suburb of Pittsburgh. The firm has built many bridges in the U.S. and elsewhere; the Historic American Engineering Record notes at least 81. American Bridge has also built or helped build the Willis Tower, the Empire State Building, the Chrysler Building, launch pads, resorts, and more. During World War II, it produced tank landing ships (LSTs) for the United States Navy. In 2020, American Bridge Company was acquired by Southland Holdings LLC.

Oakmont Country Club is a country club in Plum and Oakmont, Pennsylvania, United States. Established in 1903, the club predominantly lies in the borough of Plum, in the East Hills suburbs of Pittsburgh. Its golf course is regarded as the "oldest top-ranked golf course in the United States" and was designated a National Historic Landmark in 1987. The Pennsylvania Turnpike separates seven holes (two through eight) from the rest of the layout. Oakmont most recently hosted its record tenth U.S. Open in 2025.

Allegheny County (/ˌælɪˈɡeɪni/ AL-ig-AY-nee) is a county in Pennsylvania, United States. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county, after Philadelphia County. Its county seat and most populous city is Pittsburgh, Pennsylvania's second most populous city. The county is part of the Greater Pittsburgh region of the commonwealth, and is the center of the Pittsburgh media market.

Allegheny was the first county in Pennsylvania to be given a Native American name. It was named after the Lenape word for the Allegheny River. The meaning of "Allegheny" is uncertain. It is usually said to mean "fine river". Some historians state that the name may come from a Lenape account of an ancient mythical tribe called "Allegewi" who lived along the river before being taken over by the Lenape.

Charles Taze Russell (February 16, 1852 – October 31, 1916), or Pastor Russell, was an American Adventist minister from Pittsburgh, Pennsylvania, and founder of the Bible Student movement. He was an early Christian Zionist.

In July 1879, Russell began publishing a monthly religious magazine, Zion's Watch Tower and Herald of Christ's Presence. In 1881, he co-founded Zion's Watch Tower Tract Society with William Henry Conley as president. In 1884 the corporation was registered, with Russell as president. Russell wrote many articles, books, tracts, pamphlets and sermons, totaling approximately 50,000 pages. From 1886 to 1904, he published a six-volume Bible study series titled Millennial Dawn, later renamed Studies in the Scriptures, nearly 20 million copies of which were printed and distributed around the world in several languages during his lifetime. (A seventh volume was commissioned by his successor as society president, Joseph Rutherford, and published in 1917.) The Watch Tower Society ceased publication of Russell's writings in 1927, though his books are still published by several independent groups.

The Watch Tower Bible and Tract Society of Pennsylvania is a non-stock, not-for-profit organization headquartered in Warwick, New York. It is the main legal entity used worldwide by Jehovah's Witnesses to direct, administer, and disseminate doctrines for the group and is often referred to by members of the denomination simply as "the Society". It is the parent organization of a number of Watch Tower subsidiaries, including the Watchtower Society of New York and the International Bible Students Association. The number of voting shareholders of the corporation is limited to between 300 and 500 "mature, active and faithful" male Jehovah's Witnesses. About 5,800 Jehovah's Witnesses provide voluntary unpaid labor, as members of a religious order, in three large Watch Tower Society facilities in New York. Nearly 15,000 other members of the order work at the Watch Tower Society's other facilities worldwide.

The organization was formed in 1881 as Zion's Watch Tower Tract Society for the purpose of distributing religious tracts. The society was incorporated in Pittsburgh, Pennsylvania, on December 15, 1884. In 1896, the society was renamed Watch Tower Bible and Tract Society. Following a leadership dispute in the Bible Student movement, the society remained associated with the branch of the movement that became known as Jehovah's Witnesses. In 1955, the corporation was renamed Watch Tower Bible and Tract Society of Pennsylvania. In 1976, all activities of the Watch Tower Society were brought under the supervision of the Governing Body of Jehovah's Witnesses.

Reading (/ˈrɛdɪŋ/ RED-ing; Pennsylvania German: Reddin) is a city in Berks County, Pennsylvania, United States, and its county seat. The city had a population of 95,112 at the 2020 census and is the fourth-most populous city in Pennsylvania after Philadelphia, Pittsburgh, and Allentown. Reading is located in the southeastern part of the state and is the principal city of the Greater Reading area, which had 420,152 residents in 2020.

Reading gives its name to the now-defunct Reading Company, also known as the Reading Railroad and since acquired by Conrail, that played a vital role in transporting anthracite coal from Pennsylvania's Coal Region to major East Coast markets through the Port of Philadelphia for much of the 19th and 20th centuries. Reading Railroad is one of the four railroad properties in the classic U.S. version of the Monopoly board game. Reading was one of the first localities where outlet shopping became a tourist industry. It has been known as "The Pretzel City" because numerous local pretzel bakeries are based in the city and its suburbs; currently, Bachman, Dieffenbach, Tom Sturgis, and Unique Pretzel bakeries call the Reading area home. In recent years, the Reading area has become a destination for cyclists with more than 125 miles (201 km) of trails in five major preserves; the region is an International Mountain Bicycling Association ride center.

Upper Darby Township, often shortened to Upper Darby, is a home rule township in Delaware County, Pennsylvania, United States. As of the 2020 census, the township had a total population of 85,681, making it the state's sixth-most populated municipality after Philadelphia, Pittsburgh, Allentown, Reading, and Erie. Upper Darby borders Philadelphia, the nation's sixth-most populous city, and constitutes part of the Delaware Valley, also known as the Philadelphia metropolitan area, the nation's seventh-largest metropolitan area.

Upper Darby is home to the Tower Theater, a historic music venue on 69th Street built in the 1920s, and to several Underground Railroad sites. In August 2019, the radio tower on top of the theater was removed due to structural concerns.

The Flight 93 National Memorial is a memorial built to commemorate the crash of United Airlines Flight 93, which was one of four aircraft hijacked during the September 11 attacks in 2001. The memorial is located in Somerset County, Pennsylvania, with the vast majority in Stonycreek Township, and with a small portion in Shade Township. It is 78 miles (126 km) southeast of Pittsburgh, 122 miles (196 km) west of Harrisburg (the state capital), and 226 miles (364 km) west of Philadelphia.

A national memorial was created to honor the passengers and crew of Flight 93, who stopped the terrorists from reaching their target by fighting the hijackers. A temporary memorial to the 40 victims was established soon after the crash. The first phase of the permanent memorial was completed, opened, and dedicated on September 10, 2011. The design for the memorial is a modified version of the entry Crescent of Embrace by Paul and Milena Murdoch.

Shanksville is a borough in Somerset County, Pennsylvania, United States. It has a population of 199 as of the 2020 U.S. census. It is part of the Somerset, Pennsylvania Micropolitan Statistical Area and is located 78 miles (126 km) southeast of Pittsburgh and 226 miles (364 km) west of Philadelphia.

Shanksville garnered global attention during the September 11 attacks when United Airlines Flight 93, bound from Newark, New Jersey, for San Francisco, crashed in adjacent Stonycreek Township after its passengers rebelled against the flight's al-Qaeda terrorist hijackers. It was the only one of the four hijacked planes that failed to reach the terrorists' intended target.

Dippy is a composite Diplodocus skeleton in Pittsburgh's Carnegie Museum of Natural History, and the holotype of the species Diplodocus carnegii. It is considered the most famous single dinosaur skeleton in the world, due to the numerous plaster casts donated by Andrew Carnegie to several major museums around the world at the beginning of the 20th century.

The casting and distribution of the skeleton made the word dinosaur a household word; for millions of people it became the first dinosaur they had ever seen. It was also responsible for the subsequent popularity of the entire genus Diplodocus, since the skeleton has been on display in more places than any other sauropod dinosaur.

The Carnegie Museum of Natural History (abbreviated as CMNH) is a natural history museum in the Oakland neighborhood of Pittsburgh, Pennsylvania. It was founded by Pittsburgh-based industrialist Andrew Carnegie in 1896. Housing some 22 million specimens, the museum features one of the most extensive paleontological and entomological collections in the world.