Perhaps, the easiest hike and most interesting hike in Hocking Hills (located in Ohio about an hour southeast of Columbus) is Rock House. Rock House is a one mile hike into an interesting cave-like formation they call Rock House. It has doors for entries, windows to look out, and even a deck (be careful, it's a long ways down). The hike is relatively easy, although you are going to have to do a little climbing.
Now I do have to warn you, when you enter the Rock House, there is a good chance someone might already be in there, and that may give you a little scare if your paths meet. As well, the birds living in Rock House create some spooky sounds.
Enjoy the pictures of this beautiful formation.