Location The Gothic Karlstejn Castle sits high atop a hill around 18 miles southwest of Prague. It was established by the Czech king and Roman emperor Charles IV as a place to store the royal treasures, collections or holy relics and the crown jewels. History The castle was originally built in the Gothic style and reconstructed in the Renaissance style in the 16th century. It owes its present look to the purist Neo-Gothic style designed by architect Josef Mocker at the end of the 19th ...