Sofia is one of Europe's oldest cities, with wide, cobblestone boulevards, charming boutiques and ruins to http://explorepic.twitter.com/l1MbV4Uxcz

Sofia is one of Europe's oldest cities, with wide, cobblestone boulevards, charming boutiques and ruins to explore http://pic.twitter.com/l1MbV4Uxcz

https://twitter.com/NatGeoTravel/status/918149604901900290