Spending $30 a person to go tour a cavern isn't typically on my to-do list when traveling somewhere new. I like geologic formations as much as the next person I suppose, but generally prefer to skip touristry attractions for time outside.
We were in Virginia for a few days and had a bit of time to kill after our hike to Kennedy Peak. Adam was very excited about the idea of spelunking and checking out a cavern and after a quick google search, the caverns did seem pretty interesting. They are the largest caverns in eastern America and it's more than just a quick look at some rocks, a 1.25-mile path takes you into and through the caverns. Your ticket also comes with admission to two smaller museums on the property. The first is "Toy Town Junction" featuring a walk through history via toys of different eras, and access to the "Car & Carriage Caravan Museum" a blast from the automotive past for any car junky. We spent about an hour and a half exploring all three attractions and both agreed the caverns were even more impressive than we expected and worth the stop.