Want to escape the crowds and get a taste of spelunking? Guided tours have been designed to visit Pivka Cave and Black Cave, parts of the Postojna cave system that are not open on regular tours. These tours can be relatively tame, or involve hardhats, overalls, water obstacles and a little abseiling, depending on your wishes.
Tours last from 1½ to six hours, with expert guiding and equipment provided. They are available year-round; bookings must be made at least three days in advance.