Take a private small group 6 to 7 hour tour from prague to terezn theresienstadt which was built in the 1790s by habsburg emperor joseph ii as a fortress to guard the northern approaches to the bohemian heartlands learn about the small fortress which forms part of the terezn fortification systemand was used inworld war ii as a prison and place of punishment for both military and political prisoners as a concentration transit camp and a ghetto it was used for jews from the protectorat