The Saint George Rotunda is a small red-brick church tucked into a courtyard in central Sofia, surrounded by the remains of the Roman city of Serdica. Built in the early fourth century, it is widely considered the oldest preserved building in the Bulgarian capital. Its circular form and quiet setting make a striking contrast to the government buildings and hotel that now enclose it.
The rotunda has served different purposes across Sofia’s long history: it became a Christian church in late antiquity and was used as a mosque during Ottoman rule. Inside, layers of medieval frescoes reveal successive chapters of its religious life. Look up at the dome for the surviving figures and decorative fragments, then take time to explore the exposed Roman streets and foundations outside.
The church is still used for worship, so dress modestly and be considerate if a service is taking place. Opening hours can change, and photography rules may be restricted inside; check locally before your visit. The courtyard is easy to miss, so look for the entrance near the Presidency and Sofia Hotel Balkan.