Bottomless Pit in USA

Bottomless Pit

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.

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.