Plovdiv, Bulgaria

Continuously inhabited since: 3000 BC ~ 4000 BC
Plovdiv is the second largest city in Bulgaria. Plovdiv's history spans 6,000 years, with traces of a Neolithic settlement dating to roughly 4000 BC, ranking it among the world's oldest cities. Archaeologists have discovered fine pottery and other objects of everyday life from as early as the Neolithic age, showing that in the end of the fourth millennium BC there already was an established settlement there. Plovdiv was originally a Tracian settlement before becoming a major Roman city. It later fell into Byzantine and Ottoman hands, before becoming a part of Bulgaria. The city is a major cultural centre and boasts many ancient remains, including a Roman amphitheatre and aqueduct, and Ottoman baths.