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The Mark Twain and Cameron Caves were amazing! Jackson was our tour guide and he did a great job. Bobbi was our tour guide for the Trolley Tour and she was so wonderful: the passion she put into telling us about Hannibal and the way she remembered us hours later when we took the trolley back into town made us feel really special. These caves and the tours are an absolute MUST if you visit Hannibal. You will not regret it. The Mark Twain cave is family friendly and all lit up while the Cameron cave is much more suited for adults, longer of a tour, and you explore it all via flashlights!