Niagara Falls (Cayuga: Gahnawehta? or Tgahnaw?hta?) is the collective name for three waterfalls that straddle the international border between the Canadian province of Ontario and the U.S. state of New York. They form the southern end of the Niagara Gorge.
From largest to smallest, the three waterfalls are the Horseshoe Falls, the American Falls and the Bridal Veil Falls. The Horseshoe Falls lie on the Canadian side and the American Falls on the American side, separated by Goat Island. The smaller Bridal Veil Falls are also located on the American side, separated from the other waterfalls by Luna Island. The international boundary line was originally drawn through Horseshoe Falls in 1819, but the boundary has long been in dispute due to natural erosion and construction.
Located on the Niagara River, which drains Lake Erie into Lake Ontario, the combined falls form the highest flow rate of any waterfall in the world, with a vertical drop of more than 165 feet (50 m). Horseshoe Falls is the most powerful waterfall in North America, as measured by vertical height and also by flow rate. The falls are located 17 miles (27 km) north-northwest of Buffalo, New York and 75 miles (121 km) south-southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York.
Already a huge tourist attraction and favorite spot for honeymooners, Niagara Falls visits rose sharply in 1953 after the release of Niagara, a movie starring Marilyn Monroe and Joseph Cotten. Later in the 20th century, the falls was a featured location in 1980s movie Superman II, and was itself the subject of a popular IMAX movie, Niagara: Miracles, Myths and Magic. Much of the episode Return of the Technodrome in the 1987 Teenage Mutant Ninja Turtles cartoon series take place near the Niagara Falls and its hydroelectric plant. Illusionist David Copperfield performed a trick in which he appeared to travel over the Horseshoe Falls in 1990. The falls, or more particularly, the tourist-supported complex near the Falls, was the setting of the short-lived Canadian television show Wonderfalls in early 2004. More recently, location footage of the falls was shot in October 2006 to portray "World's End" of the movie Pirates of the Caribbean: At World's End.[Read article at Wikipedia
Here is an interesting post from the Niagara Falls Blog called A Scene from the movie Niagara ? Then and Now showing the fictional ?Rainbow Cabins? from the movie and their respective Falls location.