Spent one amazing day at the Grand Canyon and Hoover Dam. I had flown over both before, but had never had an "on ground" experience with either. The Hoover Dam was built in 4 years, 1931-1935. The engineering that went intov which at the time was the world's largest dam is simply incredible. The water that it holds is the main source of water for millions of people. You can see the "water line" in the photo below. Pray for rain, pray for snow. It needs replenishing to raise the levels. After Hoover Dam, which is situated on the Arizona-Nevada line, the tour went to the West Rim of the Grand Canyon. Wow! All I can say is "God Made This." The Indians own this part of the Grand Canyon which is on reservation land, and not U.S. Government land. They have built a skywalk bridge that you can walk out and over the rim. There are no fences or any barriers along the top of the rim, to keep it more natural. The Colorado River which runs through the bottom of the canyon was muddy brown from recent rains. The natural color is an emerald green which is due to the minerals in the rocks. The view down and across is breathtaking, and it truly is one of the "7 Wonders of the World."