Arizona, United States of America
One of the seven natural wonders of the world, the Grand Canyon is a distinctive sight. Stretching up to 18 miles (29 km) wide, it plunges over a mile down to meet the Colorado River. The estimated age of the Grand Canyon itself ranges from 70 million years old to 6 million years old, but the stunning red rock contains strata from both the Proterozoic and Paleozoic eras.
The Grand Canyon was home to Native Americans for thousands of years, and was considered to be a holy site for the Pueblo people. Spanish explorers discovered the canyon in 1540 but one of the most famous explorations was undertaken by John Wesley Powell. In 1869, he led a group of nine men on the dangerous journey along the Colorado River. Six men completed the mission, with three of the company electing to leave the expedition after many days of ferocious rapids. They were never seen again. The Grand Canyon was designated as a national moment in 1908, becoming a national park in 1919.