Prague Castle is a castle (fort de facto) in Prague's Hradcany district, the traditional seat of Czech rulers since 1918 President of the Republic. Successive extensions and modifications of the Castle was founded in the 9th century one of the largest ancient castle in the world (according to Guinness World Records is in their dimensions of length 570 m and 130 m wide largest castle in the world). It is often considered a symbol of the Czech Republic. The castle is St. Vitus Cathedral, where as the Czech crown jewels stored or buried many Czech rulers.