The family-friendly Indiana Caverns near the city of Corydon opened to the public back in 2013. They are officially a part of the Binkley Cave system. Binkley Cave is the state’s longest cave and is one of America’s top ten caves. The Indiana Caverns staff offers visitors several different options including various cave tours and even kayaking on a subterranean river where you can spot cave crayfish.
The rust-red cavern here in Nevada’s Valley of Fire State Park in Overton is no more than four feet wide and not much deeper. Still, the otherworld-like rock formations and striking color make it truly worth a visit. See how the powerful wind eroded the sandstone there to form the wondrous Windstone Arch and an assortment of other alien-like shapes as well.