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The Grand Canyon's valleys and millions of years of rock layers spanning Earth's history have earned it a designation as one of the Seven Natural Wonders of the World. But, according to a new UNLV study, its marvels extend to vast cave systems that lie beneath the surface, which just might hold clues to better understand the future of climate change—by studying nature's past.

Grand Canyon National Park is one of the most visited parks in the U.S. despite its reputation as an extremely hot region. Temperatures at the bottom of the canyon average near 60°C (140°F) during the summer months and can be even hotter on trails leading down because the dark-colored walls absorb heat.