The Grand Canyon, Arizona's unique and ancient natural wonder, is so famous that it has inspired "Grand Canyons" all over, from the "Grand Canyon of the Yellowstone" to the "Grand Canyon of the East." One of the most impressive of all might be Copper Canyon, Mexico's answer to the Grand Canyon. Spanning 25,000 square miles, with sections more than a mile deep, Copper Canyon is actually "grander" than the original. In fact, it's four times bigger than Arizona's famous canyon.