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:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.