7 Astonishing Things Seen By Humankind Only Once

Niagara Falls was left waterless in 1969.

In 1969, the USA and Canadian governments had to take steps to stop the erosion of Niagra Falls. In June of 1969, Niagara Falls was made to flow through an artificial corridor in order to create a dike and strengthen the slopes at the top of it. The main event, of course, was the waterfall without water itself. Thousands of tourists went there to see the dry Niagara Falls with their own eyes.