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http://www.thelostsea.com/history.html Also see http://en.wikipedia.org/wiki/The_Lost_Sea Craighead Caverns. CLICK HERE for lots of photos. The Lost Sea, or Western Interior Seaway, was a warm, shallow sea that covered the Great Plains in the Late Cretaceous 70 million years ago. Teeming with 20-foot sharks, 40-foot mosasaurs and squid-like belemnites, it vanished millions of years ago. One theory is that the western edge of the Plains was thrust up by geographic activity. This forced the water out, leaving the Plains covered with marine fossils.

http://en.wikipedia.org/wiki/Bell_Witch_Cave Bell Witch Cave. Also see, http://www.prairieghosts.com/b-cave.html Bell Witch Cave, book, history/lore and 1 photo of entrance.

http://en.wikipedia.org/wiki/Big_Bone_Cave Big Bone Cave, Rock Island State Park manages tours which are limited. http://www.state.tn.us/environment/na/natareas/bonecave/ is part of the Tennessee. gov website, Find 2 photos.

http://en.wikipedia.org/wiki/Cumberland_Caverns Cumberland Caverns. Known as the states' largest "show caves" and the following site has lots of photos with plenty of information. http://www.cumberlandcaverns.com/default.htm and look for the Photo Gallery.

http://en.wikipedia.org/wiki/Dunbar_Cave_State_Park Dunbar Cave State Park http://cleanairtn.org/environment/parks/DunbarCave/ This 110-acre natural area in Montgomery County is honeycombed by caves and sinkholes, the most prominent being Dunbar Cave. This 8.1 mile cave has historical, natural, archaeological and geological significance. Excavations revealed that this cave has been occupied by man for thousands of years, drawn by its constant stream flow and natural air conditioning. There is no mention of tours and there were no photos. They do promote fishing.

http://en.wikipedia.org/wiki/Gillespie_Cave Gillespie Cave, no longer accessible. The following site had nothing to do with the Gillespie Cave and there were no other hits on the google search.

http://ezinearticles.com/?Buddys-Plunge-Part-3-of-Tennessee-Cave&id=341307 This is an account of searchers who enter a cave (seems to have no name, just picked up because one of the group had the last name of Gillespie) Look to the lower part of the article and go to the http://www.hucosystems.com site and enjoy a beautiful photo of a cave entrance in Georgia. It says check back often for more photos and articles but original info was dated 1988 and it doesn't look like more was added.

http://en.wikipedia.org/wiki/Hubbard%27s_Cave Hubbard's Cave. Where bats are protected. http://www.state.tn.us/environment/na/natareas/hubbards/ is the Tennessee. gov website http://www.nature.org/wherewework/northamerica/states/tennessee/preserves/art10128.html This site gives a bit more description and has some details explaining how and why the entrances are "bat gated."

http://en.wikipedia.org/wiki/Lookout_Mountain_Caverns Lookout Mountain Caverns, no longer accessible. http://ngeorgia.com/ang/Lookout_Mountain This site relates to the mountain and its history in Georgia. No other mention of caves at all. Ruby Falls and the cave it is in are part of Lookout Mountain.

http://en.wikipedia.org/wiki/Ruby_Falls This is the tallest underground waterfall. http://www.rubyfalls.com/ Find much info and plenty of new photos and old ones as well.

http://en.wikipedia.org/wiki/Nickajack_Cave Nickajack Cave. The following link gives you some grand old photos. Look to the bottom of the page for scans of old pamphlets. But enlarge to see all the photographs: http://nickajackcave.com/ Lots of history and intrigue. By the reading of it, the cave is huge but closed to protect an endangered breed of bat. The underground lake was called the largest in the country.

http://en.wikipedia.org/wiki/Raccoon_Mountain_Caverns Raccoon Mountain Caverns. Look at http://www.raccoonmountain.com/ where it mentions the views of both Lookout Mountain and Raccoon Mountain while being in Lookout Valley. Some photos of the caverns and info about their tours.

http://en.wikipedia.org/wiki/Snail_Shell_Cave Snail Shell Cave. The following link, http://www.scci.org/preserves/snailshell/ gives an account of the efforts to protect the extremely long cave from vandals and harm. Snail Shell is the longest continuous cave in the Tennessee Central Basin region, with more than 9 miles of surveyed passages. It is part of a system of caves comprising more than 13 miles of known passages.

http://en.wikipedia.org/wiki/Caving This link defines the history of caving, what spelunking really is and has some beautiful photos as well.

http://en.wikipedia.org/wiki/TAG_Corner TAG or TAG Corner (Tenn., Alabama & Georgia) This page does not look at any one cavern but rather covers the area of the three states and how they are connected.