The architectural heart of ancient Serdica, the Roman Empire-era predecessor of Bulgaria's capital of Sofia, is emerging amid excavations for the construction of the city metro system.
In a couple of years, the finds will become part of an underground museum where visitors will be able to walk in the footsteps of Constantine the Great (272-337 AD), the first Roman emperor to legalise Christianity and adopt it himself.
Modern Sofia lies on several archaeological layers left by the ...
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