The impressive Bohemian Gothic Karlstejn Castle in Prague was built in the 14th century by Charles IV, the Czech King and Roman Emperor. At that time the castle held the treasure of the Holy Roman Empire including the imperial coronation jewels. The foundation stone of Karlstejn was laid in 1348 and the main building works lasted to 1356, the year of Charles' coronation as emperor. Charles IV devoted care to the rich interior decoration of the castle until the time of his death on 1378. The castle was modified in the Renaissance style and re-built in the purism style between the 19th and 20th century.
The castle is extremely popular with locals as well as tourists, and the streets are packed with souvenir vendors, tour groups and even school groups, especially in the summer months. A private exclusive tour can be booked.