Thunder Hole

The ocean here does the work. Thunder Hole is a small cave along the rocky Atlantic shoreline of Acadia National Park where incoming waves compress trapped air and send spray more than 40 feet into the air — loudest an hour or two before high tide. Stone stairways with metal handrails lead to a lower deck at the water's edge. Come when the tide is turning. The lower deck is wet, and rogue waves have a way of making their point without warning.