The Park Cave is an underground tunnel system in the Park on the Ilm, originally created at the end of the 18th century for the establishment of a brewery. Today, the twelve-meter-deep passages and tunnels allow for an exploration of 200,000 years of earth and human history. The Park Cave is located twelve meters deep between the steep slope towards the Ilm and the Belvedere Alley. A staircase near the Liszt House leads down to the tunnel, which ends at the so-called "Needle’s Eye," an artificially created rock gate on the Ilm.