The Hocking Hills is very popular with tourists, and collectively is known as the Hocking Hills Region. It features many private inns, campgrounds, cabins, restaurants, and other related businesses, including a recently developed zip-line. Within the park are several spectacular features based around rock formations, such as:
Conkle’s Hollow 
Cedar Falls 
Ash Cave 
Old Man’s Cave
Let’s talk a little bit about history of this area.
More than 330 million years ago, the Hocking Hills State Park area was relatively level and was covered by the waters of the Atlantic Ocean.
For millions of years, the oceans currents deposited immense amounts of sand and gravel. After millions of years, the ocean receded, and the sandy layers bonded with silica to form the Black Hand Sandstone that underlies the area.
It formed like a sandwich, with a hard top and bottom and a soft middle layer. When the Appalachian Mountains arose, form and feature were cast upon the area and created this beautiful landscape that you can see in the Hocking Hills State Park.
As always you can found more photos from Hocking Hills Park here