my wife and I have traveled extensively in the last decade and visited several of the waterfalls you listed – worldwide and USA. Victoria and Iguassu but not Niagara which is ridiculous since we live in Georgia. It is high on the bucket list. Agree with you that the Yosemite Valley is one the most beautiful valleys anywhere. Have also seen the Yellowstone and Multnomah falls among others. Have floated down the Colorado River in the Grand Canyon but did not get to Havasu Falls. FYI, the most visited national park by far is the Great Smoky Mountains National Park in Tennessee/North Carolina. Thanks for sharing this website.