Add Sofia, Bulgaria. The earliest archaeological evidence of the occupation of the territory of Sofia is from the early Neolithic (VI millennium BC) - among them is the Slatina Neolithic settlement. The earliest records of the settlement of the ancient city center - the area around the mineral springs of today's Central Mineral Bath - are from the Bronze Age (II millennium BC). Reports of this settlement are sparse as the city has continued to exist for thousands of years and many of the remains have been destroyed, but it remains uninterrupted to this day.