Lehman's is an excellent tour cave, just on the Nevada side of the Utah/Nevada border. They do a 60 minute and a 90 minute tour. The cave has excellent formations!
More information can be found at http://www.climb-utah.com/Misc/lehman.htm
Although not technically in Utah it is so close and so amazing that we had to show it here.
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Old stairs at the original entrance.
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The "Gothic Palace" Room
More information can be found at http://www.climb-utah.com/Misc/lehman.htm
Although not technically in Utah it is so close and so amazing that we had to show it here.

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Old stairs at the original entrance.
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The "Gothic Palace" Room