The Grand Canyon in Arizona is one of the seven natural wonders of the world and a World Heritage Site. This geological wonder is one mile deep, 18 miles wide, and 277 river miles long. Some visitors to the Grand Canyon only spend a few hours there, driving into the park, peering down into the big hole in the ground in front of them, and then going on their way. But there is so much more to see and so many things to do at the Grand Canyon you can easily spend a few days there if not even longer.