Sofia is the capital and largest city of the Republic of Bulgaria, with a population of 1,246,791, and some 1,377,761 in the metropolitan area, the Capital Municipality. It is located in western Bulgaria, at the foot of the mountain massif Vitosha, and is the administrative, cultural, and economic centre of the country.
The history of Sofia dates back to the 8th century B.C, when Thracians established a settlement there. Sofia has had several names in the different periods of its existence, and remnants of the city's millenary history can still be seen today alongside modern landmarks. Sofia is one of the oldest capital cities in Europe, blending its past and present in a remarkable architectural style. Historic landmarks include the 10th-century Boyana Church, the Alexander Nevski Cathedral, and the early Byzantine Saint Sofia Church. More modern architecture is represented by the Bulgarian National Opera and Ballet, the Ivan Vazov National Theatre, the Rakovski Str theatre district, Slaveykov Square's outdoor book market, and the NDK. Sofia is the see of an Eastern Orthodox and of a Roman Catholic diocese.