2 articles
Cave of Swallows
The Cave of Swallows, Spanish Sótano de las Golondrinas, is an open-air pit cave in Aquismón, San Luis Potosí, Mexico, and the largest known cave shaft in the world.
Nutty Putty Cave
Nutty Putty Cave, a hydrothermal limestone cave near Elberta, Utah County, Utah, discovered in 1960 by Dale Green; sealed with concrete in December 2009 after John Edward Jones died trapped upside down, his body unrecovered inside.