Back in 1959 there were no modern air flight restrictions and this provided an opportunity for military pilots training at Nellis Air Force Base to fly through the nearby Grand Canyon, sometimes flying so low that the river water sprayed up as they buzzed by overhead. Smithsonian Air & Space Magazine posted on their website an amazing video recording from the cockpit from one such trip. The plane dips so low that at times it looks like the pilot is just a couple feet above the canyon river.