Castle chapel in the context of "Berlin Cathedral"

The Île de la Cité (French: [il d(ə) la site]; lit. "Island of the City") is one of two natural islands on the Seine River (alongside Île Saint-Louis) in central Paris. It spans 22.5 hectares (56 acres) of land. In the 4th century, it was the site of the fortress of the area governor for the Roman Empire. In 508, Clovis I, the first King of the Franks, established his palace on the island. In the 12th century, its importance as a religious centre increased with the building of Notre-Dame cathedral, and the castle chapel of Sainte-Chapelle. The city hospital, the Hôtel-Dieu, possibly the oldest continuously operating hospital in the world, is also based on the island. Nearby is the site of the city's oldest surviving bridge, the Pont Neuf.

Even with the departure of the French kings to the Louvre Palace across the right bank, and later to the Palace of Versailles, the island remained a centre of administration and law courts. In 1302, it hosted the first meeting of the Parlement of Paris in the old royal palace and was later the site of the trials of aristocrats during the French Revolution. Today, in addition to the prominent cathedral and other shrines, it is the home of the Préfecture de Police, the Palais de Justice, and the Tribunal de commerce de Paris. The Mémorial des Martyrs de la Déportation, a memorial to the 200,000 people deported from Vichy France to Nazi concentration camps during the Second World War, is located at the eastern end of the island. As of 2016, the island's population was 891.

A gate tower is a tower built over or next to a major gateway.

Usually it is part of a medieval fortification. This may be a town or city wall, fortress, castle or castle chapel. The gate tower may be built as a twin tower on either side of an entranceway. Even in the design of modern building complexes, gate towers may be constructed symbolically as a main entrance. The gate tower can also stand as a twin tower on both sides of a gate system. Gate towers are also used symbolically as the main entrance in the design of modern building complexes. The Kasselburg in Rhineland-Palatinate has a double tower gate tower, which was also used as a residential tower.

St George's Chapel, formally titled The King's Free Chapel of the College of St George, Windsor Castle, at Windsor Castle in England is a castle chapel built in the late-medieval Perpendicular Gothic style. It is a royal peculiar (a church under the direct jurisdiction of the monarch), and the Chapel of the Order of the Garter. St George's Chapel was founded in the 14th century by King Edward III and extensively enlarged in the late 15th century. It is located in the Lower Ward of the castle.

The castle has belonged to the monarchy for almost 1,000 years. The chapel has been the scene of many royal services, weddings and burials – in the 19th century, St George's Chapel and the nearby Frogmore Gardens superseded Westminster Abbey as the chosen burial place for the British royal family. The running of the chapel is the responsibility of the dean and canons of Windsor who make up the College of Saint George. They are assisted by a clerk, verger and other staff. The Society of the Friends of St George's and Descendants of the Knights of the Garter, a registered charity, was established in 1931 to assist the college in maintaining the chapel.