Karlštejn is a market town in Beroun District in the Central Bohemian Region of the Czech Republic. It has about 800 inhabitants. It is kno…Karlštejn is a market town in Beroun District in the Central Bohemian Region of the Czech Republic. It has about 800 inhabitants. It is known for the Karlštejn Castle, which is among the most visited tourist destinations in the country.