Serdica Archaeological Complex

The Serdica Archaeological Complex occupies the Largo, the monumental ensemble around Nezavisimost Square in central Sofia, Bulgaria. It preserves the remains of ancient Serdica, a Thracian settlement that became a Roman municipium under Emperor Trajan in the early 2nd century CE and later grew into the capital of the province of Dacia Mediterranea. Under Constantine the Great in the early 4th century the city received monumental buildings, and Serdica hosted a major church council in the middle of that century. The remains visible today date mainly from the 3rd to 6th centuries, when the city was fortified and rebuilt after Hunnic raids in the 5th century and Justinian-era repairs.

Most of the complex was uncovered during construction of Serdika metro station between 2010 and 2012. Archaeologists exposed stretches of paved Roman streets with their original stone slabs and drainage channels, residential buildings with mosaics and heating systems, a section of the city wall, and the Eastern Gate of Serdica, including its towers. The finds are displayed in situ rather than in a conventional gallery. Visitors descend into the metro mezzanine and walk beside the streets at their original depth, several metres below the modern pavement, while outdoor excavations around the Largo remain visible from the surface at any hour.

The curatorial approach is open-air and immersive. Glass barriers, lit walkways and information panels in Bulgarian and English let passers-by see the ancient street grid without entering a museum. Small display cases in the station show everyday objects recovered during the dig, such as pottery, coins and tools. Some of the best-preserved features include the cobbled decumanus-style street, the gate towers and the ruins of residential blocks with floor mosaics.

The site is managed as part of the city centre and conserved by the municipality and archaeological specialists. Parts of the stonework were reinforced and covered by protective roofs, while the Eastern Gate and neighbouring streets are integrated into the Largo's public space, close to the Council of Ministers building, the former Party House and the Sveta Nedelya Church. Preservation is generally good, although open-air sections are exposed to weather and require regular maintenance. The complex is a convenient first stop for anyone tracing Sofia's history from antiquity to the present day, and it connects naturally with the nearby Rotunda of St George and the Basilica of St Sofia.