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Bottomless Pit - Monticello Dam Drain Hole in in Lake Berryessa, Napa County, California, USA.
This is not a natural phenomenon, but still extraordinary. Glory holes are used for dam's to drain excess water during dry seasons. This is the largest one of them all in the world.
https://plus.google.com/108496131965965723428/posts/XDvQuDEzPQJ
This is not a natural phenomenon, but still extraordinary. Glory holes are used for dam's to drain excess water during dry seasons. This is the largest one of them all in the world.
https://plus.google.com/108496131965965723428/posts/XDvQuDEzPQJ