Marcianopolis
Bulgaria, Bulgaria
Marcianopolis or Marcianople, also known as Parthenopolis was an ancient Greek, then Roman capital city and archbishopric in Moesia Inferior. It is located at the site of modern-day Devnya, Bulgaria. The ancient city has been partially excavated and is renowned for its museum collection of ancient mosaic floors from villas in the city.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).