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The cavern is more than one-half mile long, and visitors will walk up and down 448 stairs one way – 896 round trip – as they visit the nine separate “rooms” or chambers. The largest of these chambers, the ballroom, measures more than 300 feet across and 90 feet high.

The process that started the formation of Minnetonka Cave began when the sediments that formed the limestone beds of the cave were deposited, about 340 million years ago, in an ancestral tropical sea thought to have been situated near the present-day Idaho-Oregon state line.


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