Buzludja is the largest monument of ideological communism in Bulgaria. The building was created by architect Georgi Stoilov. The building took seven years of hard work, which was attended by more than 6,000 workers and 20 leading Bulgarian artists. Above the interior decoration painters worked for 18 months. The facility was officially opened in 1981, the day of the 1300 anniversary of the founding of the Bulgarian state. Somewhere at the bottom of the building was laid by a capsule with a message to future generations, which explains the significance of the whole structure.