Crystal Lake Cave – Dubuque, Iowa - Atlas Obscura
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Crystal Lake Cave

Dubuque, Iowa

An underground wonderland in Iowa. 

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Crystal Lake Cave Christie F / CC BY-SA 2.0
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In 1868, while searching for ore-bearing stone in Iowa, miner James Rice came across an especially striking sight. An underground cavern filled with striking cave formations made up of crystals including argonite, travertine, satin stalagmite, stalactite, and calcareous spar. Below the cavern roof sits a small pool of crystal-clear water.

The underground wonder was known as Rice’s Cave at first, then Linden’s Cave when the property was transferred to Charles Linden. It became known as Crystal Lake in the 1930s, when Bernard Markus (Linden’s son-in-law) took over operations. Today, it is one of the longest-operating show caves in the state of Iowa.

Know Before You Go

The cave is open to visitors between May and mid-October.

crystals underground subterranean sites caves geology
Nearby
Dubuque Shot Tower
4.87 miles
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4.96 miles
Union Park
8.70 miles
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