The Peklo Cave was built by the Liechtensteiners in the Valtice Castle Park.
There used to be a wooden pavilion on top of the artificial cave, from which there was a beautiful view of the castle, the town of Valtice, and Mikulov, which is further away. The pavilion has not survived and the cave itself is now inaccessible. Nevertheless, it is possible to look inside at least from the outside.