The building was constructed in 1885 to serve as the Provincial Council of Eastern Rumelia. It was designed by architect Pietro Montani and is considered one of his most significant creative achievements.
The museum exhibition “The Unification of Bulgaria, 1885” was opened on September 19, 1985, to commemorate the 100th anniversary of the Unification of the Principality of Bulgaria and Eastern Rumelia - an event that has become a national symbol in modern Bulgarian history. Covering an area of 1,000 square meters, the exhibition features original artifacts, weapons, photographs, and documents that trace the efforts of the Bulgarian people in building Eastern Rumelia as a “second” Bulgarian state, their struggle for unification with the Principality of Bulgaria, and its military defense - Тhe Serbo-Bulgarian War.

Day for free visit: Every first Thursday of the month for students and retired people.