The Rotunda of St George (Sveti Georgi)

Century a.d. the rule of Emperor Constantine the Great built in the early IVth, Rotunda St. George (Sveti Georgi) in Sofia is the oldest preserved building closed. He is now accessible from the internal House of a joint 24 / 7 The President has the court.
Vith the first century wall paintings in the temple during the reign of Emperor Justinian I Byzantyne. Converted into a mosque during the Ottoman reign. Was restored in 1915, the minarets of a Christian temple was destroyed and the inside walls of the upper layer was removed to uncover the ancient wall paintings. Today, part of the UNESCO world heritage site.
For me, Sofia, is the best sign of the city's other churches such as the great and glorious as it is.