Beat the July heat with this Ohio cave tour, where cool air, underground passages, and natural wonder make the trip worth it.

Add Yahoo as a preferred source to see more of our stories on Google. After a four-year closure, Crystal Cave is inviting visitors to "marvel at its underground splendor," Sequoia Parks Conservancy ...

Whether it’s 100 degrees or below-freezing, these caverns in the Sierra Nevada foothills stay at a constant temperature for ...