1. Horseshoe Falls is moving upstream — roughly 30 cm per year due to erosion. Two-thirds of the river is diverted for hydroelectric power, which has slowed the process tenfold.
2. The falls were once turned off — partially, in 1969, when engineers diverted the American Falls to study erosion.
3. The water is green because of dissolved minerals and finely ground rock suspended in the flow.
4. Annie Edson Taylor, a 63-year-old schoolteacher, was the first person to survive going over in a barrel — in 1901.
5. Average flow over Horseshoe Falls is about 2,400 cubic metres per second in peak summer.
6. Drop height is 57 metres on the Canadian side, 21–34 metres on the American side.
7. The Niagara Parkway was called "the prettiest Sunday afternoon drive in the world" by Winston Churchill.
8. Nightly illuminations have run since 1925.
9. The river is the border between Canada and the United States.
10. The honeymoon legend started with Theodosia Burr Alston, Aaron Burr's daughter, in 1801.