The Underworld of Peca – a unique underground biking and canoeing adventure through abandoned mine tunnels. Thanks to centuries of mining beneath Peca, thousands of kilometers of tunnels have been created, which can be explored in various ways. You can take a train into the heart of the mountain and stroll along the museum trail. The more adventurous can explore the museum trail via a well-maintained bike path with headlamps, or set off on a kayaking adventure across the underground lakes.