In June 1969, U.S. engineers diverted the flow of the Niagara River away from the American side of the falls for several months to remove the large amount of loose rock from the base of the waterfall.
The first photo shows a dry Niagara Falls. The second photo shows as it normally appears.
They abandoned the project a few months later because the expense was too great.Link
A picture of my cave
..
..
