The park began its life as the Sieur de Monts National Monument, created on July 8, 1916, by President Woodrow Wilson. It became a national park in 1919 and assumed its current name 10 years later. Later, John D. Rockefeller Jr. directed the construction of the popular network of carriage roads.

Acadia was the nation’s first national park in the East, and it was the first park created entirely through private donations.

The milestone coincides with the creation of the 100th anniversary of the National Park Service next month. The park service oversees more than 400 units, including 59 national parks.