In central Riga, the Soviet security services had established their headquarters. It was not until June 1940 until July 2, 1941, when the Germans occupied Riga. The second period lasted from September 1944 until the fall of the Soviet Union in 1991. The house was also called Corner house because it was located in the corner of the streets Stabu and Brivibas. Thousands of Soviet opponents were imprisoned and tortured in the basement of the headquarters. For thousands of letters, headquarters became a staging point before being deported to labor camps in Siberia.

Current status: Preserved with monument (2010).

Address: Brivibas iela 61, Centra rajons, Riga, LV-1010.

Get there: Tram.

My comment:

When I was there in 2010, the former headquarters was not a museum but housed by the local police, but is now a museum. In another place in Riga there is an interesting museum, the Museum of the Occupation of Latvia, which partly depicts the Nazi occupation of Latvia, partly the communist occupation, and, of which the latter done much deeper wounds in the Latvian identity.

Follow up in books: Andrew, Christopher: The KGB (1990).