The American and Horseshoe Falls are both famous for their rainbows, which can be seen year round from certain vantage points on the ground. The Rainbow Bridge border crossing was named for this phenomena.

This image was taken from a low-flying plane. That vantage point gave a unique perspective not only on Niagara Falls (Canada AND the U.S.). We see both rainbows.

And, counting the Rainbow Bridge, it is the only image I am aware of which has three rainbows.

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