We stopped at Luray Caverns in Virginia just like I had done with my Mom and Dad 60 years ago. Here is the entrance building and visitors center building up on a hill. It stays cool all summer long for free from the cool air coming up from the natural caverns here. It was discovered in 1878 and is still the largest caverns in the U.S.A. It is located in Northern Virginia near the Shenandoah National Park.