Museum of the Occupation of Latvia 1940-1991 (Latvijas okupācijas muzejs) is an historic educational institution. It was established in 1993 to exhibit artifacts, archive documents, and educate the public about the 51-year period in the 20th century when Latvia was successively occupied by the USSR in 1940, then by Nazi Germany in 1941, and then again by the USSR in 1944.
The museum's stated mission is to show what happened in Latvia, its land and people under two occupying totalitarian regimes from 1940 to 1991, remind the world of the crimes committed by foreign powers against the state and people of Latvia and remember the victims of the occupation: those who perished, were persecuted, forcefully deported or fled the terror of the occupation regimes.
The building of the museum was built already in 1971 to celebrate Lenin's 100th birthday and up until 1991 it served as the Museum of Red Latvian Riflemen.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.