The Bulgarian Socialist Party is recognised as the successor of the Bulgarian Social Democratic Workers' Party created on 2 August 1891 on Buzludzha peak by Dimitar Blagoev, designated in 1903 as the Bulgarian Social Democratic Workers' Party (Narrow Socialists) and later as the Bulgarian Communist Party.
The Buzludzha Monument on the peak was built by the Bulgarian communist regime to commemorate the events in 1891 when the socialists led by Dimitar Blagoev assembled secretly in the area to form an organised socialist movement with the founding of the Bulgarian Social Democratic Party, a fore-runner of the Bulgarian Communist Party.