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Photo Gallery: U.S. Landmarks and National Parks
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Photo: Rocky shoreline in Acadia National Park
Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan Photo: The Treasury at Petra, Jordan
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Thunder Hole is a must-see in Maine's Acadia National Park. The feature gets its name from the roar created when waves rush into a narrow slot in the rocks, forcing compressed air out with a boom.

Tim Fitzharris/Minden Pictures
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National Parks Guide
National Parks Guide