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Operation Elster ("Magpie" in English) was a German espionage mission intended to gather intelligence on U.S. military and technology facilities during World War II. The mission commenced in September 1944 with two Nazi agents sailing from Kiel, Germany on the U-1230 and coming ashore in Maine on November 29, 1944. The agents were William Colepaugh, an American-born defector to Germany, and Erich Gimpel, an experienced German intelligence operative. They spent nearly a month living in New York City, expending large amounts of cash on entertainment, but accomplishing none of their mission goals. Colepaugh quickly lost his commitment to espionage, and hoping to avoid the death penalty for treason, turned himself in to the FBI and betrayed his partner Gimpel, effectively ending the operation in late December 1944. In February 1945, the two agents were convicted of espionage by a military court and sentenced to death. At the time, the military tribunal which named American citizens in a conspiracy to commit treason was only the third of its kind ever held in the history of the US. When the war ended, their sentence was subsequently commuted to life imprisonment by President Harry S. Truman. Gimpel was paroled in 1955, and Colepaugh in 1960. Operation Elster was one of only two times the Germans landed agents on American shores by submarine during the war. Despite a number of claims and speculations that the mission was intended to sabotage the Manhattan Project, no supportive evidence exists in the official investigative records.

The Hancock Point School is a historic former school building at 644 Point Road in Hancock, Maine. Built c. 1870, this wood frame one-room schoolhouse served as a school until 1940, and is now privately owned. It is the town's only surviving district schoolhouse, and was listed on the National Register of Historic Places in 2013.

The Sorrento Library is located on Waukeag Avenue in the summer resort town of Sorrento, Maine. It is located in an architecturally distinguished Colonial Revival building, designed by Ball and Dabney and built in 1892-93, that also functions as a community meeting space. The building was listed on the National Register of Historic Places in 1995.

The Skillings River is a 7-mile-long (11 km) tidal river in Hancock County, Maine, flowing to Frenchman Bay. For most of its length it forms the boundary between the towns of Hancock and Lamoine.

Sorrento is a town in Hancock County, Maine, United States. The population was 279 at the 2020 census.

The Granite Store is a historic commercial building in United States Route 1 in Sullivan, Maine. It is an unusual example of Greek Revival architecture, executed in rough-cut granite, probably built between 1835 and 1850. The building was listed on the National Register of Historic Places in 1974. It is now apparently in residential use.

Sullivan is a town in Hancock County, Maine, United States. The population was 1,219 at the 2020 census. The town was named for Daniel Sullivan, an early settler. Colloquially referred to as "Sully" or "the Sullivans"—like many Maine municipalities composed of villages with geographic designations of the town proper—the municipality was incorporated in 1789. Located in the Upper Schoodic Peninsula sub-region of Maine's Downeast Acadia region, the municipality has been known as "Waukeag", "New Bristol", and later Sullivan; and once included the nearby communities of Hancock, Sorrento, and what would later be (parts of Gouldsboro Point TWP, Tunk Lake TWP, the Schoodic Foothills, Hog Bay, and various other districts over time divided off) Township 7, South & Middle Districts. Once home to abundant granite quarries, the town of Sullivan is now a residential community for nearby Ellsworth and Mount Desert Island. Located along U.S. Route 1, the Taunton River, and Hog Bay, Sullivan is home to a reversing tidal falls and many scenic turnouts that dot the Schoodic National Scenic Byway along the Upper Schoodic Peninsula.

The Church of Our Father is a historic Episcopal church in Hulls Cove, a village of Bar Harbor, Maine. Built in 1890-91 to a design by William Masters Carmac, it is an excellent local interpretation of English Gothic Revival architecture executed in stone. It was part of a period trend in the construction of architect-designed summer chapels in coastal Maine. The building was listed on the National Register of Historic Places in 1999.

The Hulls Cove High School is a historic former school building on Maine State Route 3 in the Hulls Cove village of Bar Harbor, Maine. It is locally distinctive for its architecture, having been designed by the firm of Andrews, Jaques & Rantoul, which was responsible for designing a number of Bar Harbor's large summer estates. The school was built in 1909 and was used until the 1940s, after which it was converted to a community center. It was listed on the National Register of Historic Places in 1999.

The Cover Farm is an historic farmstead on Maine State Route 3 in the Hulls Cove village of Bar Harbor, Maine on Mount Desert Island. Its centerpiece is an early 19th-century Cape, set on a parcel of land owned until 1810 by the granddaughter of the island's original French proprietor, Antoine de la Mothe Cadillac. In the early 20th century, the property was transformed into a summer estate, with the addition of a Colonial Revival wing and a walled garden. The property was listed on the National Register of Historic Places in 1995.

Hancock is a town in Hancock County, Maine, United States. The population was 2,466 at the 2020 census. Located on the mainland at the head of Frenchman Bay, Hancock has commanding views of Mount Desert Island.

Shore Acres is a historic former summer hotel at 791 Lamoine Beach Road in Lamoine, Maine. With a possible construction history dating to about 1800, it is one of the coastal community's oldest buildings, and is the only surviving 19th-century hostelry in the town. Extensively altered in 1887 and operated as an inn between 1887 and 1942 as the Des Isles Inn, it is now a summer rental property, located within walking distance of Lamoine Beach State Park. The property was listed on the National Register of Historic Places in 2000.