Gov. Edward Kavanaugh House

St. Patrick's Catholic Church is a historic church at 380 Academy Hill Road in Newcastle, Maine. Built in 1807, it is the oldest surviving Roman Catholic church building in New England, and was listed on the National Register of Historic Places in 1973. It remains in use as a community within the Parish of All Saints in the Diocese of Portland.

Lincoln Academy (Lincoln or LA) is a private boarding and day school and town academy located in Newcastle, Maine, serving students in Lincoln County, the United States, and other nations around the world. Lincoln Academy is the fourth oldest secondary school in Maine. The majority of Lincoln Academy students live in local sending towns, including Newcastle, Damariscotta, Bristol, Jefferson, Nobleboro, and South Bristol. Similar to other town academies, the sending towns pay tuition for local students.

The Glidden-Austin Block is a historic commercial building at 52 Main Street in Newcastle, Maine. Built in 1845, it is a prominent local example of mid-19th century commercial architecture, occupying a prominent location in the community's downtown area. It was listed on the National Register of Historic Places on April 28, 1975.

Newcastle is a town in Lincoln County, Maine, United States. The population was 1,848 at the 2020 census. The village of Newcastle is located in the eastern part of the town, on the Damariscotta River. Together with the village of Damariscotta linked by the Main Street bridge, they form the Twin Villages (see Damariscotta-Newcastle CDP).

Newcastle is a census-designated place (CDP) comprising the main village of the town of Newcastle in Lincoln County, Maine, United States. The population was 667 at the 2010 census, out of 1,752 in the entire town. In the 2000 census, the village was part of the Damariscotta-Newcastle CDP.

The Second Congregational Church is a historic church on River Street in Newcastle, Maine. Built in 1848, it is one of Mid Coast Maine's finest examples of brick Gothic Revival architecture. It was listed on the National Register of Historic Places in 1979. The congregation, established in 1843, is affiliated with the United Church of Christ.

St. Andrew's Church is a historic Episcopal church at 11 Glidden Street in Newcastle, Maine. Built in 1883, it was the first example of cottage Gothic Revival church in the country, and the first US design of English architect Henry Vaughan, a major proponent of the style. It was listed on the National Register of Historic Places in 1976.

Damariscotta-Newcastle was a census-designated place (CDP) in Lincoln County, Maine, United States. It designated a concentration of population around where the most developed portions of the towns of Damariscotta and Newcastle meet, generally corresponding to the "Twin Villages" area. As of the 2000 census, the CDP population was 1,751 (roughly half of the combined population of the two towns). For the 2010 census, the area was delineated as two separate CDPs, Damariscotta and Newcastle.

The Main Street Historic District encompasses the historic commercial center of Damariscotta, Maine. Although the community was settled in the 18th century, most of its downtown area dates to the second half of the 19th century due to an 1845 fire. Lining Main Street east of the Damariscotta River, the downtown has a well-preserved collection of commercial, residential, and civic structures from the period. The district was added to the National Register of Historic Places in 1979, and enlarged in 2001.

The Stephen Coffin House is a historic house at 170 Main Street in downtown Damariscotta, Maine. Built in the first decade of the 19th century, it is a fine local example of Federal style architecture, and is further distinctive for its ell, which is an early surviving example of an attached shop. The house served for many years as home to the Skidompha Public Library, and is now in commercial use. It was listed on the National Register of Historic Places in 1987.

The Skidompha Public Library is the public library serving Damariscotta, Newcastle, and Nobleboro in Maine.

The Chapman-Hall House is a historic house museum at 270 Main Street in Damariscotta, Maine. Built in 1754 by one of the area's first permanent white settlers, it is the oldest standing house in the town, and one of the oldest in the state. It was listed on the National Register of Historic Places in 1970.