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"Descending about 120 feet into an Ice Age–era world of centuries-old stalactites, stalagmites, and subterranean lakes felt otherworldly, and while the guided tours reveal stunning cavernous chambers, I would caution that the approach passages are tight—so it’s not for the claustrophobic and it’s wise to contact operators in advance, though walk-in tours may be available during peak season." - Katherine Cusumano, David LaHuta
