Kartchner Caverns

Kartchner Caverns, near Benson, Arizona, is a relatively recently discovered series of limestone caves.  In 1974, two amateur cavers found a crack in the bottom of a sinkhole that was emitting warm moist air that smelled faintly of bat guano.  They opened the crack to the width of a coat hanger and squeezed themselves through.  What they discovered was well beyond their expectations.

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