Sofia is the capital of the Balkan nation of Bulgaria. It?s in the west of the country, below Vitosha Mountain. The city?s landmarks reflect more than 2,000 years of history, including Greek, Roman, Ottoman and Soviet occupation. Medieval Boyana Church has 13th-century frescoes. Built by the Romans in the 4th century, St. George Rotunda Church has medieval and Ottoman decoration dating to the 10th century.