You don’t walk on the streets of Sofia — you walk on centuries.Under your feet: forgotten temples, ruined walls, hidden foundations. Sofia is not built on land.It’s built on layers. The Thracian Layer – The Oldest Memory Before Serdica, before the Romans, there was Thrace. A people of rituals, warriors, and sanctuaries — their traces are scattered across the city, quiet and mostly invisible. You’ll find them not in monuments, but in the memory of the soil itself. The Roman Layer – Serdica “Serdica is my Rome,” said Constantine the Great.Beneath central Sofia lie the ruins of forums, basilicas, gates, streets — the bones of a provincial Roman capital.Unearthed during metro construction, parts survive, but much has been lost to time, construction, and silence.The city below the city still breathes — if you know where to look. The Ottoman Layer – The Overlooked Century 14th to 19th century — a long, often neglected chapter.Wooden houses, mosques, baths. Some dismantled. Some relocat...