We have been in other caves, but the sheer size of Mammoth Cave is impressive. We booked in advance based on some advice and from someone that we know were so glad theat we did. The River Styx tour is only offered once a day and for a few weeks of the year, so it was sold out by the time we arrived at 8:00 am for our 8:30 tour. The ranger, Sue was very knowledgeable. She decribed this as the only tour that goes from top to bottom. This is a 2 1/2 hour hike that covers the Historic Tour route plus addiitonal river and lake a further 50 feet down. You can feel the cool air (54F or 12C) as you arrive at the natural entrance. Fat Man's Misery is a really neat part of the hike as are a few passgaes where youhave to crouch or climb down narrow stairs. We saw bats, learned about cave life and felt water drip on us. You do not need to be in exceptional physical condition, but you do need to be able to walk at a good pace and fit into smaller spaces. When we came out, the hot air (90F+ or 32C+) really hit us and fogge d up our glasses. Unlike another cave we were in, we were allowed to take pictures. A wonderful experience!
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