Waterfalls... Where is the prettiest waterfall you have seen?

When I was a teenager, my mom took us on a vacation to various places in New York state. One of the places we visited while there was Letchworth State Park, which is the site of the Genesee River gorge. It might not have been the biggest falls I've seen (I've been to both sides of Niagara Falls), they were the most beautiful. The Genesee River travels through the gorge it has cut over centuries, and there are three big falls along it's course. There's a site with pictures: http://www.perrychamber.com/letchworth-park.php . Sadly, it was a one-time visit for us.