Mt. Desert Island, Acadia National Park is the second most visited national park in the United States. Prospect Harbor Light marks the eastern entrance to the inner harbor. It's one of Maine's older lighthouses built in 1850 and rebuilt in 1891. Prospect Harbor is a prominent fishing village and the area has always been known as one of the best anchorage grounds on the Maine coast.
Prospect is now part of a military base.
The keeper's house is used for guest housing. The light can be easily photographed from Prospect Harbor. The height above water is 42 feet and the range of the light is 7 nautical miles. The lighthouse board deactivated the light in 1859 but reactivated it in 1870. The light was automated in 1934.