Our Pick
Posted on @rawstates
The Great Stalacpipe Organ
1956
Luray Caverns, Page County, Virginia
Jon Callas from San Jose, USA · CC BY 2.0 · Wikimedia Commons
A Pentagon mathematician spent three years tapping stalactites across three and a half acres of cave, finding the ones already close to pitch, sanding them to true, and wiring rubber mallets to a console. Pressing a key strikes a rock formation somewhere in the dark, and the whole cavern is the instrument, which by any reasonable measure makes it the largest one on earth. Couples get married in front of it.
That was 1 of the hidden places.
Location: historic site
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