Hrad Karlstein which had been one of the places we wanted to visit. Hrad Karlstein is a beautiful castle only 25 km away from Prague. As you may have guessed from the name, it was build by the Czech King and Roman Emperor Charles IV in the 14th century. It was the place for safekeeping of the royal treasuries, particularly a collection of holy relics and Imperial crown jewels. The record shows that Charles IV himself stayed in the castle to supervise the building works and interior decoration in 1355.
There are tours almost every hour even in English. The tour does not include the viewing of Chapel of The Holy Cross in The Great Tower, which we really wanted to see, during the winter time (they said it is only open to the VIPs which obviously we are not), but it takes you through major rooms such as Emperor's Bedchamber and Audience Hall.