Tallinn, Estonia
This is the most recent and least-developed historical attraction in Tallinn. Originally decreed by tsar Nicholas I in 1820 as a fortress to protect the city from the sea-born attacks, it was turned into a notorious KGB prison in 1920. The prison ceased operations only in 2004. Entry €2, guided tour
s from €6, or pay €40 for a three-hour "new prisoner experience" culminating in a last meal with a glass of schnapps (but no execution).
Listen to the audio guide for #patarei Free on WIP — starts by itself when you arrive, even with the screen off