One of the most impressive natural wonders in the world, Niagara Falls consists of three waterfalls that straddle Canada and the U.S. border. Together they form the highest flow rate of any waterfall on earth. Interestingly, Niagara Falls has receded about seven miles in the last 12,000 years due to erosion. Niagara Falls is home to a variety of wildlife and is a source of hydroelectric power. Remarkably, daredevils have often used barrels to plunge over the falls!