Wyanotte Caves, a pair of limestone caves located on the Ohio River in Harrison-Crawford State Forest in Crawford County, five miles (8 km) north-east of Leavenworth and 12 miles (19 km) from Corydon in southern Indiana, is a popular tourist attraction. Wyandotte Caves were designated a National Natural Landmark in 1972. It is now part of O'Bannon Woods State Park. The cave system is the largest in the state of Indiana.