Starting at Parking Lot 1, this one-way trail is more difficult with some hills and steps. Rock House is unique in the Hocking Hills region, as it is the only true cave in the park. It is a tunnel-like corridor situated midway up a 150-foot cliff of Blackhand sandstone. This “House of Rock” has a ceiling 25-feet high while the main corridor is 200-feet long and 20- to 30-feet wide.