Check out the Grand Canyon, the most wondrous place in the US

The Grand Canyon is a big fissure in the Colorado Plateau that exposes uplifted Proterozoic and Paleozoic strata, and is also one of the 19 distinct physiographic sections of the Colorado Plateau province. It is not the deepest canyon in the world (Kali Gandaki Gorge in Nepal is far deeper), however, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape. Geologically it is significant because of the thick sequence of ancient rocks that is beautifully preserved and exposed in the walls of the canyon. These rock layers record much of the early geologic history of the North American continent.