The story of Golem is one of the darkest Prague legends!
According to the legend Golem was an immortal humanoid created by the most famous rabbi from the history of Prague Jewish Quarter, Judah Loew ben Bezalel. Rabbi went to the river bank, made the beast out of clay and stones and brought him to live by putting ancient scriptures in his mouth. Golem listened to the commands of its creator up until a fatal mistake. Rabbi Loew had to put Golem to sleep every sabbath's eve, but one day he forgot to do that, and Golem went berserk. Fearing the destruction of the Jewish Quarter, Rabbi "deactivated" Golem and providently locked him up in the attic of the Old New Synagogue. Since then nobody is allowed to visit this place! Rumor has it that numerous gapers never found their way out of that attic.