My wife and I had to kill a damp afternoon. Looked at things to do in Bristol and the Caverns were highly recommended. We arrived at 3pm, paid our $15 and expected a canned guided tour through a limestone cavern. The tour exceeded our expectations. The caverns are huge! They are spectacular. The guide was a geologist who knew his rocks and history of the cave. It helped that we were being given a private tour because we were the only patrons. We spent almost 1.5 hours going through the accessible areas. The lighting allows for great photography and around every turn was something surprising and stunningly beautiful. Well worth the visit. This isn't your everyday cavern.