My favorite part of Niagara Falls is the Bridal Veil (the very small stream of water just to the right of the American falls when you’re looking at them from the front). It just seems so tiny, but it must be strong because it’s avoided merging with the rest of the waterfall up til now.

I can’t say I recommend doing that thing where you go “behind the falls,” because pretty much all you do is walk around in a giant iron pipe behind the water, from which you can only see the falls through small holes, and not very closely.