Most recently, during excavation near Sveta Nadalya square in the heart of the Sofia city, archaeologists unearthed remains of two churches belonging to the 14th and 16th century. Stretches of the traditional east-west street in Roman cities, christened the Decumanus Maximus, and the north-south urban axis, christened the Cardo Maxima, have also been found. Interestingly, these arteries of ancient cities coincide with the locations of state institutions and shopping areas in modern day Sofia.

Archaeologists have also found remains of an eight-room mansion - complete with a patio, arched galleries, mosaic-covered living areas and baths - believed to be the residence of a local ruler. Two sixth century toilets, considered as an extremely rare find, is also discovered. A 5.5 metre wide and 17 metre long section of slate stone street leading to the mansion has also been uncovered.

The planned design in the city's representative centre Largo includes a two hectare pedestrian zone at the upper level, the glass dome museum housing a model of the ancient city of Serdica at the middle level and the subway train station at the lower level. The metro train will pass 24 metres underground.

Finding archaeological ruins is pretty common, but finding an ancient city buried beneath a bustling modern day metropolis is sure rare. A trip to Sofia to take a look at these ruins and the unique museum sure seems to be in place!!!