Looking for a private tour to Sofia ? Do you know that Sofia is the second oldest city in Europe? Founded 7, 000 years ago by the Thracian tribe Serdi? What does Sofia have to do with Roman provinces? Through the ages, the city played an important role as a trading center in the Byzantine and Bulgarian Empires. When was Sofia the center of Rumelia province? A local charismatic guide will reveal the secrets and interesting facts about the architectural styles of the compact city center, Boyana Church and the National History Museum are one of the largest in the Balkans.