Here are a couple of panoramas and photos that I took on my visit to Grand Canyon National Park in Arizona. I have provided a little bit of background info courtesy of Wikipedia when available. Enjoy!
Grand Canyon National Park is one of the United States' oldest national parks and is located in Arizona. Within the park lies the Grand Canyon, a gorge of the Colorado River, considered to be one of the major natural wonders of the world. The park covers 1,902 mi² (4927 km²) of unincorporated area in Coconino County and Mohave County.
The Grand Canyon itself, including its extensive system of tributary canyons, is valued for the combination of large size, depth, and the exposed layering of colorful rocks dating back to Precambrian times. It was created through the incision of the Colorado River and its tributaries after the Colorado Plateau was uplifted and the Colorado River system developed along its present path.
More info here