Divided between two countries
Today, Niagara Falls is split between two countries, with both an American and a Canadian side. Taken together, the countries receive about 30 million tourists every year. During peak hours, visitors can see the water tumble down at a rate of six million cubic feet per minute. Wow!
An interesting detail: the amount of water that flows down the falls decreases significantly at night. A 1950 treaty allows local businesses to direct more of the power to their power plants at times when the spectacular view is impacted the least. However, it is not the only time that the volume of the waterfall changes.