Tallinn's Museum of Occupations marked its 10th anniversary this week, and also held a seminar attended by two heads of state.
President Toomas Hendrik Ilves and visiting German President Gauck, a leader of the human rights movement in the former GDR, attended yesterday's event, entitled "What Will We Remember in the Future?"
The museum anniversary on July 8 was also dedicated to a 1941 massacre in Tartu prison.
The Museum of Occupations was founded in 2003 to study the processes that took place in society from 1940-1991.
In her speech, museum director Kadri Viires discussed whether and how the values from the museum's founding were still salient today.
Jüri Adams, a legal scholar who helped draft the Constitution, waxed political, saying the museum could be the institution that calls on Russia to return archives it expatriated at the end of the occupation.
Former dissidents and prisoners of conscience under the Soviet regime Mart Niklus and Kalju Mätik also spoke.