Archeological goldmine found during Sofia subway build

The construction of a new metro line in Sofia, the capital of Bulgaria, has unearthed some marvels including major sections of Serdica, the Roman city and vacation site for Constantine the Great.

Excavations have found "new stretches of Serdica's Decumanus Maximus – the traditional east-west street in Roman cities, which served predominantly administrative and defence purposes; as well as parts of the Cardo Maxima – the main north-south urban axis, which used to be home to crafts and trade."

One exceptional find is the remains of a nobleman's mansion, complete with patio, mosaics and two 6th century tiolets.