Via Egnatia travelers soaked in these thermal springs after traversing wine regions — Romans drank Melnik wine, then bathed in HOT SPRINGS to recover from their journeys. The water flowing at Sandanski thermal spa hotels is IDENTICAL to what Romans used 2,000 years ago, since geology doesn't change. Book spa treatment (€20-50 range), enter naturally hot pools (40-60°C), feel the mineral content and sulfuric smell, and contemplate that Roman soldiers and wine merchants bathed in this exact same water after marching and trading.
🔄 BACKUP: If full spa is too expensive, visit public mineral water fountain in town (free). Drink/touch the water. It's the SAME source, just not a bath.