Solnitsata

Solnitsata was a prehistoric town located in present-day Bulgaria, near the modern city of Provadia [1]. It is the oldest salt production center in continental Europe (5500‑4200 BC) [1]. The settlement was walled to protect the salt, a crucial commodity in antiquity [1]. Salt production drove Solnitsata's economy, and the town is believed to have supplied salt throughout the Balkans [1]. Researchers suggest that some of the residential buildings in the settlement were two-story [1]. The town is believed to have been destroyed by an earthquake [1].