This remarkable, partly covered excavation site, situated just above the Serdika metro station, displays the remains of the Roman city, Serdica, that once occupied this area. The remains were unearthed from 2010 to 2012 during construction of the metro. There are fragments of eight streets, an early Christian basilica, baths and houses dating from the 4th to 6th centuries. Plenty of signage in English.