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About 4.5 million annual visitors venture to the southern rim of the Grand Canyon National Park to peer into its 1.6-kilometre-deep abyss, where the Colorado River rushes through rocks that date back 1.8 billion years. A day-long hike down the Bright Angel or South Kaibab trails affords visitors ample opportunity to appreciate the rugged sandstone surfaces, but nearly 40,000 people every year opt to extend their journey overnight and rest for the challenging ascent. Still, even those who remain at the rim can soak up the sweeping desert plateaus, which become even more stunning as the sun goes down.