Wikipedia
Karlštejn Castle (; ) is a large Gothic castle founded 1348 CE by Charles IV, Holy Roman Emperor-elect and King of Bohemia. The castle served as a place for safekeeping the Imperial Regalia as well as the Bohemian/Czech crown jewels, holy relics, and other royal treasures. Located about southwest of Prague above the village of the same name, it is one of the most famous and most frequently visited castles in the Czech Republic.
Karlštejn is a market town in the Central Bohemian Region of the Czech Republic.
In 1952, it was named after Karlštejn Castle.
Karlštejn (1916) is an opera by Czech composer Vítězslav Novák, a pupil of Dvořák. It was the composer's second opera and written with nationalist intentions during World War I. The plot is based on Jaroslav Vrchlický's drama of the same name. It was moderately successful and performed over 70 times in Prague.