Lynn Chadbourne of Dayton, Ohio, takes pictures at Thunder Hole in Acadia National Park on Friday, the park's season-opening day.
Zander Chilson lays down at the top of Cadillac Mountain and encourages his brother Connor, right, to do the same to avoid gusty winds. They boys were exploring Acadia National Park with their grandparents on Friday.
The sun's rays strike the rocky coast of Acadia National Park May 2, 2013. The Associated Press
The Bubbles, a pair of mountains at Acadia National Park are seen from Jordan Pond, Thursday, May 25, 2006. The Associated Press
Like a frozen waterfall, a wall of ice more than 40-feet-high stretches down to the high-tide line on Otter Cliffs overlooking the Atlantic Ocean, in this time-exposure made Thursday, March 6, 2014, at Acadia National Park. The Associated Press
A line of hikers files up the Beehive Trail near Sand Beach at Acadia National Park in Bar Harbor. Michael G. Seamans/Staff Photographer
Visitors soaking up the early-morning view from Cadillac Mountain. In 2016, Acadia will celebrate its 100th anniversary.
A white pine with brown needles is seen on Cadillac Mountain, Thursday, May 25, 2006, at Acadia National Park. High ozone levels in Acadia threaten the white pine, Maine's state tree. The Associated Press
Professional photo guide Vincent Lawrence of Seal Harbor, left, and his client Frank Gallagher, of Silver Spring, Md., move to a new position while photographing the rocky coast of Acadia National Park at dawn, Friday, Oct. 3, 2014. The Associated Press
Visitors to Cadillac Mountain take in the view of Bar Harbor and Acadia National Park on Wednesday. Kevin Bennett Photo
Sunlight shines through maple leaves on the edge of Echo Lake in Acadia National Park, photographed on October 2, 2009. Gregory Rec/Staff Photographer
Deb Rechholtz of Bar Harbor skis under a bridge at Acadia National Park on Jan. 8. Photo by Gregory Rec/Staff Photographer
Overlooking Schoodic Harbor in Acadia National Park Friday, April 15, 2011. Staff Photo by Shawn Patrick Ouellette
In this July 13, 2010 photo, a stream flows under one of the carriage road bridges in Acadia National Park, which has 175 miles of trails, bicycle and carriage roads. The Associated Press
A stream in Acadia National Park on Mt. Desert Island captures some of the park's beauty on Tuesday, June 21, 2005. The Associated Press
A red light from the Bass Harbor Head Lighthouse illuminates the sky near Tremont, at the south end of Mount Desert Island.
Private homes are seen from the Park Loop Road overlooking Frenchman's Bay at Acadia National Park, Friday, May 26, 2006. The Associated Press
Visitors to Acadia National Park watch the sun rise from the summit of Cadillac Mountain, Friday, Sept. 3, 1999, near Bar Harbor, Maine. The Associated Press
In this June 20, 2005 file photo, flowers in bloom by a stream are seen in Acadia National Park. The Associated Press
Crowds of people gather around Thunder Hole at Acadia National Park in Bar Harbor in July. The park may need to close at the height of the fall foliage season if congress can't reach a deal on federal spending. Staff photo by Michael G. Seamans/Staff Photographer
In this Tuesday, July 13, 2010 photo, visitors to Cadillac Mountain walk on one of the trials barely visible through the fog in Acadia National Park. The Associated Press
President Barack Obama, first lady Michelle Obama, daughters Malia and Sasha, visit Cadillac Mountain in Acadia National Park, Bar Harbor, July 16, 2010. The Associated Press
A visitor stands on a rock next to Thunder Hole, Monday, May 21, 2012, at Acadia National Park, near Bar Harbor. The Associated Press
Felicia and Andy Kalan, of Columbus, Ohio, watch the surf recede over the rocky coast while honeymooning Monday, May 21, 2012, at Acadia National Park, near Bar Harbor. The Associated Press
In this July 1, 1999 file photo, a horse and rider crosses the Waterfall Bridge on the Sargent Mountain carriage road at Acadia National Park on Mt. Desert Island, near Bar Harbor, Maine. John D. Rockefeller, Jr. planned 16 distinctive stone-faced bridges to be harmonious with the park's surroundings. The Associated Press
An ice fisherman crosses windswept Eagle Lake on an all-terrain vehicle after leaving his fishing shack, Friday, March 7, 2014, at Acadia National Park. The Associated Press
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