According to the Guinness Book of World Records, Prague Castle is the largest ancient castle in the world. The castle occupies an area of roughly 70,000 m2, and measures 570 meters in length and an average of about 130 meters in width. The castle was built in the 9th century.
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from Lonely Planet
Key Facts In This Video
Prague is often called an open-air museum of architecture, with its buildings representing a millennia of architectural expression. (0:11)
Prague Castle is home to the Czech president and is Prague's most popular tourist attraction. (0:51)
Ginger and Fred is an architectural structure in Prague named for Ginger Rogers and Fred Astaire. (2:23)