Below present ground level just behind the Church of Sveti Spas are the partly excavated remains of this once huge 6th-century Byzantine Baths Complex. Though not much to look at now, in its day this was one of the region's biggest and best spas, renowned for its curative waters; allegedly the Byzantine Emperor Constantine IV dropped by and 'cured his legs' here in 680. The baths were destroyed during Khan Krum's invasion in 812 AD.
