"These falls, located within the Havasupai Indian Reservation in the southwest corner of Grand Canyon National Park, attract visitors thanks to their bright blue and green waters and the surrounding travertine rock formations. While visiting the falls requires a permit and more than an eight-mile hike in each direction, that hasn't stopped tens of thousands of tourists from traveling here annually to admire the location's beauty. Keep in mind that you'll need to make reservations well in advance." - Travel + Leisure Editors