Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
CRYSTAL LAKE CAVE
CRYSTAL LAKE CAVE. Site of dazzling displays of rock formations. Discovered in 1868 by James Rice, a LEAD miner in search of ore-bearing stone, the cave originally had to be reached by riding in a bucket lowered by rope down a forty-five foot shaft. Ownership of the cave passed to Charles Linden who named it Linden's Cave.
In the 1930s,the site was developed as Crystal Lake Cave by Bernard Markus, a son-in-law of Linden. Markus operated the mine as a tourist attraction from 1932 until his death in 1944. The ownership then passed to Herbert Knockel and his wife Evelyn, a granddaughter of Markus. In 1978 the ownership of the land passed to James and Doris Rubel. (Photo Courtesy: http://www.dubuquepostcards.com)
http://www.youtube.com/watch?v=llxDPXUg9ak
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Source:
YouTube user: llxDPXUg9ak
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Source:
Pratt, LeRoy G. Discovering Historic Iowa, Iowa Department of Public Instruction, 1975