#1
Grand Canyon, United States
The Grand Canyon reveals nearly two billion years of Earth's geological history, making it a more profound time capsule than any other on this list. At 446 kilometers long and up to 29 kilometers wide, it exposes rock layers from the Precambrian to the Permian period, with the Colorado River carving 1.6 billion-year-old Vishnu Schist at its base.
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