Former Gestapo/KGB prison from the 1940s to 1990.
The prison downstairs is still intact and makes for grim viewing.
One interesting point is that while the building was controlled by the Gestapo between 1941 - 1944 from where they ran the Holocaust in Lithuania with their Lithuanian accomplices, very little coverage is given to this in the museum.
Still an essential part of your visit to Vilnius.
Aukų g. 2a, LT-01113, Vilnius
+370 5 249 81 55
www.muziejai.lt/vilnius/genocido_auku_muziejus.en.htm
www.guardian.co.uk/commentisfree/2010/sep/14/double-genocide-lithuania-holocaust-communism
Google map: bit.ly/gBjYl3