The Ancient Serdica Archaeological Complex is one of Sofia’s most intriguing historical sites, offering visitors a direct look into the city’s Roman origins. Located in the very centre of Sofia, near Serdika metro station and Nezavisimost Square, the complex preserves the remains of Ulpia Serdica, an important Roman city. Visitors can see well-preserved Roman streets, house foundations, early churches, baths, mosaics, and infrastructure, all seamlessly integrated into the modern urban environment.

The site combines outdoor and partially indoor areas. Many of the ruins are open-air and freely accessible at any time, while the covered archaeological exhibition operates with set visiting hours, usually Tuesday to Sunday from around 10:00 to 18:00, and is typically closed on Mondays. Entry to the exhibition requires a small admission fee, with discounts for students and free access for children and some other visitor groups. Guided tours in English or Bulgarian are sometimes available for an additional cost and provide valuable historical context.

There are no strict dress requirements, but comfortable footwear is recommended due to uneven stone surfaces and walkways. Photography is generally allowed, though climbing on ruins and using flash may be restricted to protect the site. The complex is open year-round and easy to combine with nearby attractions thanks to its central location. While parts of the site are accessible via ramps and glass walkways, some sections may be challenging for visitors with limited mobility, so allowing extra time is advisable.