The Serdica archaeological complex is located in the heart of Sofia, Bulgaria. It represents the remains of the ancient city of Serdica, which was an important center during the Roman Empire. The complex includes well-preserved ruins such as streets, public buildings, and a large amphitheater, showcasing the city's historical significance. Excavations at the site have revealed artifacts and structures dating back to the 1st century AD. The complex highlights the architectural styles of the time and provides insight into the daily life of its inhabitants. Today, it serves as a valuable resource for historians and archaeologists studying ancient Roman urban development.