The Sproul Homestead is located on a peninsula between the outlet of the Damariscotta River and the Johns River. The Sproul House consists of two separate houses joined in 1833. The oldest portion of the house was constructed at this location in 1749 and is a one-story Cape form with a side-gabled roof. It now functions as a rear ell. The 1815 house was moved from across the road and is two stories tall. It demonstrates the Federal style with a low-pitched hipped roof, substantial chimneys, and a symmetrical facade.

This stately home is one of the most ornately detailed Federal-style houses in Maine. It was built in 1803 by Nathan Codd (who also built the nearby St. Patrick's Catholic Church) for James Kavanaugh, who along with Matthew Cottrill, were among the first Irish settlers in this area. James arrived in Boston with Cottrill around 1780 from County Wexford, Ireland - ten years later both were in Newcastle. James invested in land and soon became a prominent lumber and shipbuilding baron.

Located on the northern edge of the village center, the Old Red Church is a well-preserved Federal period meeting house painted in an unusual color for a church of this period. The wood frame building is two stories tall with a gable front roof. The facade is symmetrical with an entrance on each side. Above the cornice in the gable end is a large louvered fan. A square tower sits just behind the front of the church. The belfry is open and the top of the tower is lined with a balustrade with finial posts.

The Old Walpole Meeting House was constructed by the residents of the Town of Bristol in the area known as Walpole. Nearly unaltered from its original appearance the Meeting House continues to serve as a place of worship during the summer months. It is believed that the original, hand shaved shingles clad the building to this day. The building has a well-documented history and it is known that the hardware was all handmade and that the glass windowpanes were imported from England. Local lore is that each window cost the price of a cow.

The Temple Intervale School is a one-story, single-room building with a gable roof and clapboard siding. An open cupola on the roof ridge holds a bell which was rung by pulling a rope in the schoolhouse. A stove was located at the opposite end of the room, providing heat for students and the teacher. The ell and woodshed were added in the early twentieth century, likely around the time the state began requiring privies (or bathrooms) at schools.

A one-story cape, the Black Horse Tavern consists of post-and-beam frame construction. It sits on a fieldstone foundation and is topped with a side-gabled roof and central chimney. It is covered with clapboard siding, and common to its era, has an unadorned entryway. The Black Horse Tavern opened in 1800. Its owner, Jerome Stephenson, came to Belfast in 1784 after serving in the Revolutionary War. One year later, he became one of the town's selectmen.

The Hallowell Historic District encompasses the commercial downtown and adjacent residential neighborhoods of Hallowell. The district contains approximately 450 buildings including commercial, residential, civic, industrial, and religious structures. Nearly 85% of the buildings in the district were constructed in the eighteenth and nineteenth centuries. Hallowell was incorporated in 1771 and at that time included land that become Augusta and Chelsea.

Designated a National Historic Landmark, the Jonathan Hamilton House is an excellent example of the Georgian style in a rural setting. The house, which overlooks the Salmon Falls River, is two-and-a-half stories and sheathed in clapboard siding with a hipped roof with dormers and four tall chimneys. The symmetrical facade has some unique features including a central door topped by a pediment and flanked by ornate pilasters and sidelights. Directly above the door is a tall rounded arch window composed of many small panes of glass.

The oldest known commercial structure in the state, the John Hancock Warehouse is located on the north bank of the York River, just east of Sewall's Bridge. The building is two stories, constructed using mortise and tenoned beams. It is sheathed in wood shingles and contains doors on three sides. The windows are located on the upper floors and contain multi-paned sashes. The second floor can be accessed via the interior staircase or a ramp on the north side.

Constructed at the turn of the nineteenth century, this one-and-a-half story cape was converted into a tea room and inn that catered to motorists along Route 1 during the rise of automobile travel at the beginning of the twentieth century. Property records pertaining to the early history of the house are unclear. Local lore maintains that the dwelling existed during the 1790s, but the first historical reference to the house is in a deed dated 1815 between two yeomen.