Roadtrip from Pennsylvania to California: Day 5: The Black Canyon and Colorado National Monument
Gunnison, Blue Mesa Lake

Imagine chiseling two parallel walls of hard gnesis and schist running the length of Manhattan and standing higher than two Empire State Buildings stacked one atop one another, with water as your only tool. At the inconceivable rate of one inch per century, it would take all of human history just to cut through five feet of rock. What you see from the rim [of the Black Canyon] is the product of two million years of patient work. – National Geographic, Guide to the National Parks of the United States
Black Canyon of the Gunnison

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Black Canyon of the Gunnison

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Colorado, Route 50

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Colorado National Monument

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