Tourists wait for the right wave to roll in to Thunder Hole at Acadia National Park on Mount Desert Island recently.

Thunder Hole is a primary feature of Acadia National Park. When the right wave rolls in to the inlet, a thunderous sound is made. 

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Tourists wait for the right wave to roll in to Thunder Hole at Acadia National Park on Mount Desert Island recently. Thunder Hole is a primary feature of Acadia National Park. When the right wave rolls in to the inlet, a thunderous sound is made.
Tourists wait for the right wave to roll in to Thunder Hole at Acadia National Park on Mount Desert Island recently. Thunder Hole is a primary feature of Acadia National Park. When the right wave rolls in to the inlet, a thunderous sound is made. Staff photo by Michael G. Seamans
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