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The Monument House of the Bulgarian Communist Party (also known as the Buzludzha Monument) was built on Buzludzha Peak in central Bulgaria by the Bulgarian government between 1971 and 1981. It commemorated the events of 1891, when a group of socialists led by Dimitar Blagoev assembled secretly in the area to form an organized socialist movement that led to the founding of the Bulgarian Social Democratic Party, a forerunner of the Bulgarian Communist Party. The monument was abandoned after the fall of the Soviet Union in 1989 and now lies derelict. Source: Wikipedia