Prague Castle is the most important Czech castle (originally an early medieval settlement) standing on a rocky promontory above the Vltava River in the center of Prague, on the hill Opyš. From the 9th century it used to be the seat of Czech princes, later kings, and since 1918 it has been the seat of the President of the Republic. Twice in history, it became the main residence of the Holy Roman Emperor.
Gradual extensions and adaptations arose from a hillfort founded in the 9th century, with its dimensions of 570 m length and 128 m width is one of the largest castle complexes in the world. The size of the castle is usually 7.28 ha, but it is still a matter of disputes. It is considered not only as a symbol of the city, but also of Czech statehood and, according to the Guinness Book of Records, the largest ancient castle in the world. It is also the largest castle ever inhabited in the world, just behind it is English Windsor.
Part of the castle is St. Vitus Cathedral, a traditional place of coronation of Czech kings and their last rest. In addition to many Czech rulers (including four emperors), Prague bishops and archbishops, clergy, nobles and other people associated with the Prague court are also buried in the cathedral some saints – a large part of the Czech patron saints (St. Wenceslas, Vitus, Adalbert, Sigismund or John) Nepomucký). Czech crown jewels are also stored here.