When we think of outdoor wonders, we tend to imagine soaring mountains and verdant forests. But these otherworldly Ohio ...

Among the main attractions is the 200,000-year old Crystal King, which is the largest free-hanging stalactite in Ohio, measuring almost 5 feet long and estimated to weigh more than 400 pounds.

Crystal Cave's ambient temperature is about 60 degrees. The guided cave tour will take about 55 minutes with time for Q&As, photo ops and, of course, breathers.

Cave tour tickets start at $25.95 for adults and $14.95 for children. Indoor putt-putt is $7 per person. Train rides are $8 per person. Gemstone panning offers packages from $8 to $32.