Thunder Hole#8 in Best Things To Do in Acadia National Park
Price & Hours
A raucous natural phenomenon, this semi-submerged cave booms an hour or two before high tide. Waves fill the cave in such a way that the slapping is as loud as a thunderstorm — hence the name — and water can spray as far as 40 feet, so wear a poncho if you want to stay dry.
To catch the big boom, there's an element of luck, as well as timing. Recent travelers said the best time to visit is when the tides are changing. Visitors also warned that it can be difficult for those with mobility issues to enjoy since the rocks can be uneven. If you venture outside of the viewing platform (which includes a railing and level steps), walk carefully; the rocks will likely be wet and slippery. When you're not admiring the spectacular show, take a moment to take in the views: you'll spot Schoodic Peninsula in the distance, Sand Beach to left and Otter Cliff to the east.
Thunder Hole is on Park Loop Road, just south of Sand Beach. This is one of the park's more notorious attractions, and it can get crowded, especially in the summer. If you don't want to drive, you can hop on the Island Explorer shuttle (take Route No. 3), or you can hike. Starting at the Sand Beach parking, there's a nearly 2-mile-long trail called Ocean Path that hugs the coastline, bringing you south toward Thunder Hole and Otter Cliff.
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#1 Cadillac Mountain
Standing about 1,530 feet in height, Cadillac Mountain wins a lot of superlatives. Not only is it the tallest mountain in the park, but it's the tallest mountain on the North Atlantic seaboard and the first point of the United States to greet the rising sun's rays from Oct. 6
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