The oldest known show cave in the world is Postojna Cave in Slovenia, with the first record of a cave tour in 1213. Other early show caves are Jasovská jaskyňa in Slovakia with inscriptions from 1452, the Sontheimer Höhle in Germany which was reportedly visited by Herzog Ulrich von Württemberg on 20 May 1516 and Vilenica Cave in Slovenia where entrance fees were taken from 1633 on. In 1649 the first authorized cave guide started guiding Baumannshöhle in the Harz in Germany - but this cave also was intensively visited much earlier.