Becca Caldwell camps 3,000ft high up on the side of a cliff, on El Capitan in Yosemite National Park, California - Hanging precariously in tents off a 3,000ft vertical cliff face wouldn't be most people's idea of the perfect camping trip. But for this daredevil couple, scaling cliffs and pitching their tents thousands of feet up is just a normal day at the office.
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