You must see

The OLDEST spa in the Czech lands

A swineherd who grazed his pigs every day also had one pig in his herd that always lagged behind the others because it limped. That is why he was not initially surprised at all that it got lost from time to time. After some time, the swineherd noticed that the pig stopped limping and was even livelier than the others. It still separated from the herd every day and so one day the swineherd decided to trail it to find out where it went to and what was behind its miraculous recovery. He followed the pig as far as a place where a hot spring rose from the ground. The pig was wallowing contentedly in the mud there. As soon as he came back home with his herd, he hurried over to yeoman Kolostůj, to whom that region belonged, to tell him what he had seen. Kolostůj founded a town in the same place which later began to be called Teplice.