Few natural formations are as awe-inspiring or intriguing as a cave. The deep, dark recesses immediately conjure up images of adventure, mystery, terror, robbers and pirates. At Cave-In-Rock in southern Illinois, you can experience this fascination for yourself. Sitting atop the high bluffs overlooking the scenic Ohio River, the heavily wooded park is named for the 55-foot-wide cave that was carved out of the limestone rock by water thousands of years ago. Trails winding along the riverbank offer views of riverboats, barges and other river scenes. Hiking, picnicking, boating and fishing are the primary activities.