Tapolca is a city in Veszprém County , the seat of the Tapolca district . Until the 1950 county settlement , the settlement belonged to Zala County . Sights Caves Experts have proved that several excavated caves in Tapolca form a common system, making it the fourth longest cave system in Hungary. The total length of the Tapolca Spring Cave is 3280 meters – although according to the leader of the local cave research group, Rezső […]