Inactive Volcanoes You Can Visit

By Marisa Lascala - 2014-03-19T17:35:41Z

George H.H. Huey / Alamy

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Mauna Kea

Hawaii

If you measure from its base beneath the ocean's surface, Mauna Kea is the tallest mountain in the world. The above-water peak is pretty impressive, too, rising 13,800 feet above sea level. The height at the summit might give you a give you a great view of the area below, but you'll want to train your eyes skyward. Being so close to the equator and with so little pollution or cloud cover, Mauna Kea is an ideal star-gazing spot, and it's become a hub for astronomers at several observatories, like the Onizuka Center for International Astronomy.

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