National monument (United States) in the context of "Bryce Canyon National Park"

Devils Postpile National Monument is a U.S. national monument located near Mammoth Mountain in Eastern California. The monument protects Devils Postpile, an unusual rock formation of columnar basalt, "all closely and perfectly fitted together like a vast mosaic." The monument encompasses 798 acres (323 ha) and includes two main attractions: the Devils Postpile formation and Rainbow Falls, a waterfall on the Middle Fork of the San Joaquin River. In addition, the John Muir Trail and Pacific Crest Trail merge into one trail as they pass through the monument. Excluding a small developed area containing the monument headquarters, visitor center and a campground, the National Monument lies within the borders of the Ansel Adams Wilderness.

Castle Clinton (also known as Fort Clinton and Castle Garden) is a restored circular sandstone fort within Battery Park at the southern end of Manhattan in New York City, United States. Built from 1808 to 1811, it was the first American immigration station, predating Ellis Island. More than 7.5 million people arrived in the United States at Fort Clinton between 1855 and 1890. Over its active life, it has also functioned as a beer garden, exhibition hall, theater, and public aquarium. The structure is a New York City designated landmark and a U.S. national monument, and it is listed on the National Register of Historic Places.

Fort Clinton was originally known as the West Battery or the Southwest Battery, occupying an artificial island off the shore of Lower Manhattan. Designed by John McComb Jr., with Jonathan Williams as consulting engineer, the fort was garrisoned in 1812 but was never used for warfare. In 1824, the New York City government converted Fort Clinton into a 6,000-seat entertainment venue known as Castle Garden, which operated until 1855. Castle Garden then served as an immigrant processing depot for 35 years. When the processing facilities were moved to Ellis Island in 1892, Castle Garden was converted into the first home of the New York Aquarium, which opened in 1896 and continued operating until 1941. The fort was expanded and renovated several times during this period.

The Papahānaumokuākea Marine National Monument (pronounced [ˈpɐpəˈhaːnɐwˈmokuwaːˈkɛjə]; PMNM) is a World Heritage listed U.S. national monument encompassing 583,000 square miles (1.5 million km) of ocean waters, including ten islands and atolls of the Northwestern Hawaiian Islands. It was first created by President George W. Bush in June 2006 with an initial 140,000 square miles (360,000 km). President Barack Obama expanded the Monument in August 2016, increasing its area more than fourfold by moving its border to the limit of the exclusive economic zone, making it one of the world's largest protected areas.

The Monument is home to more than 7,000 marine species, one quarter of which are endemic to the Hawaiian Islands, with some only found in the Monument itself. Only 5.8 square miles (15 km) of land remains above sea level, but it provides critical habitat for many terrestrial species. It also features ancient archaeological sites important to Native Hawaiians. The deeper waters are of interest to maritime historians, as it contains shipwrecks, submerged aircraft, and the remains of those who lost their lives in battles during World War II. As a protected area, the Monument is subject to a commercial fishing ban. President Joe Biden designated the marine areas of the Monument as the Papahānaumokuākea National Marine Sanctuary in 2025.

The United States has 138 protected areas known as national monuments. The president of the United States can establish a national monument by presidential proclamation, and the United States Congress can do so by legislation. The president's authority arises from the Antiquities Act of 1906, which allows the president to proclaim "historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest" as national monuments.

Concerns about protecting mostly prehistoric Native American ruins and artifacts, collectively known as antiquities, on western federal lands prompted the legislation, which allowed the president to quickly preserve public land without waiting for legislation to pass through an unconcerned Congress. The ultimate goal was to protect all historic and prehistoric sites on U.S. federal lands, and it has resulted in designation of a wide variety of ecological, cultural and historical sites.

Katmai National Park and Preserve is a United States national park and preserve in southwest Alaska, notable for the Valley of Ten Thousand Smokes and for its brown bears. The park and preserve encompass 4,093,077 acres (6,395.43 sq mi; 16,564.09 km), which is between the sizes of Connecticut and New Jersey. Most of the national park is a designated wilderness area. The park is named after Mount Katmai, its centerpiece stratovolcano. The park is located on the Alaska Peninsula, across from Kodiak Island, with headquarters in nearby King Salmon, about 290 miles (470 km) southwest of Anchorage. The area was first designated a national monument in 1918 to protect the area around the major 1912 volcanic eruption of Novarupta, which formed the Valley of Ten Thousand Smokes, a 40-square-mile (100 km), 100-to-700-foot-deep (30 to 213 m) pyroclastic flow. The park includes as many as 18 individual volcanoes, seven of which have been active since 1900.

Initially designated because of its volcanic history, the monument was left undeveloped and largely unvisited until the 1950s. The monument and surrounding lands became appreciated for their wide variety of wildlife, including an abundance of sockeye salmon and the brown bears that feed upon them. After a series of boundary expansions, the present national park and preserve were established in 1980 under the Alaska National Interest Lands Conservation Act.

The Alaska National Interest Lands Conservation Act (ANILCA) is a United States federal law signed by President Jimmy Carter on December 2, 1980. ANILCA provided varying degrees of special protection to over 157 million acres (640,000 km) of land, including national parks, national wildlife refuges, national monuments, wild and scenic rivers, recreational areas, national forests, and conservation areas. It was, and remains to date, the single largest expansion of protected lands in history and more than doubled the size of the National Park System.

The Act provided for 43.585 million acres (176,380 km) of new national parklands in Alaska; the addition of 9.8 million acres (40,000 km) to the National Wildlife Refuge System; twenty-five wild and scenic rivers, with twelve more to be studied for that designation; establishment of Misty Fjords and Admiralty Island National Monuments in Southeast Alaska; establishment of Steese National Conservation Area and White Mountains National Recreation Area to be managed by the Bureau of Land Management; the addition of 9.1 million acres (37,000 km) to the Wilderness Preservation System, and the addition of 3.35 million acres (13,600 km) to Tongass and Chugach National Forests.

The National Park Service (NPS) is an agency of the United States federal government, within the United States Department of the Interior. The service manages all national parks; most national monuments; and other natural, historical, and recreational properties, with various title designations. The United States Congress created the agency on August 25, 1916, through the National Park Service Organic Act. Its headquarters is in Washington, D.C., within the main headquarters of the Department of the Interior.

The NPS employs about 20,000 people in 433 units covering over 85 million acres (0.34 million km) in all 50 states, the District of Columbia, and U.S. territories. In 2019, the service had more than 279,000 volunteers. The agency is charged with preserving the ecological and historical integrity of the places entrusted to its management and with making them available for public use and enjoyment.

The Statue of Liberty National Monument is a United States national monument comprising Liberty Island and Ellis Island in the states of New Jersey and New York. It includes the 1886 Statue of Liberty (Liberty Enlightening the World) by sculptor Frédéric Auguste Bartholdi and the Statue of Liberty Museum, both situated on Liberty Island, as well as the former immigration station at Ellis Island, which includes the Ellis Island Immigrant Hospital.

The monument is managed by the National Park Service as part of the National Parks of New York Harbor office.

The United States has 63 national parks, which are congressionally designated protected areas operated by the National Park Service, an agency of the Department of the Interior. National parks are designated for their natural beauty, unique geological features, diverse ecosystems, and recreational opportunities, typically "because of some outstanding scenic feature or natural phenomena." While legislatively all units of the National Park System are considered equal with the same mission, national parks are generally larger and more of a destination, and hunting and extractive activities are prohibited. National monuments, on the other hand, are also frequently protected for their historical or archaeological significance. Eight national parks (including six in Alaska) are paired with a national preserve, areas with different levels of protection that are administered together but considered separate units and whose areas are not included in the figures below. The 433 units of the National Park System can be broadly referred to as national parks, but most have other formal designations.

A bill creating the first national park, Yellowstone, was signed into law by President Ulysses S. Grant in 1872, followed by Mackinac National Park in 1875 (decommissioned in 1895), and then Rock Creek Park (later merged into National Capital Parks), Sequoia and Yosemite in 1890. The Organic Act of 1916 created the National Park Service "to conserve the scenery and the natural and historic objects and wildlife therein, and to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations." Many current national parks had been previously protected as national monuments by the president under the Antiquities Act or as other designations created by Congress before being redesignated by Congress; the newest national park is New River Gorge, previously a National River, and the most recent entirely new park is National Park of American Samoa. A few former national parks are no longer designated as such, or have been disbanded. Fourteen national parks are designated UNESCO World Heritage Sites (WHS), and 21 national parks are named UNESCO Biosphere Reserves (BR), with eight national parks in both programs.