The Rotunda Church of St. George is one of Sofia’s most important historical landmarks and the oldest preserved building in the city, dating back to the 4th century AD when Sofia was the Roman city of Serdica. It is tucked away in a quiet courtyard between the Presidency building and Hotel Balkan, making it slightly hidden but easy to reach from the city centre. The church is a small, circular indoor structure built of red brick with a single dome, and it has survived centuries of political and religious change, including periods as a Byzantine church, an Ottoman mosque, and finally a Bulgarian Orthodox church.

Admission to the Rotunda is free, and it is generally open daily from morning to early evening, with hours usually around 08:00–18:00 or 19:00, depending on the season and church schedule. As it remains an active place of worship, regular services are held, so visitors are encouraged to enter between services. Modest clothing is expected, quiet behaviour is required, and photography inside may be limited to protect the historic frescoes and maintain a respectful atmosphere.

Inside, visitors can see multiple layers of frescoes dating from the medieval period, offering a rare glimpse into different stages of Bulgaria’s religious and artistic history. The Rotunda can be visited year-round and fits easily into a walking route through Sofia’s historic centre, close to Serdika Metro Station and several major attractions. Weekday mornings tend to be the calmest time to visit, and most visitors spend around 20–30 minutes appreciating this unique and atmospheric site.