Sebasticook River

Fort Halifax is a former British colonial outpost on the banks of the Sebasticook River, just above its mouth at the Kennebec River, in Winslow, Maine. Originally built as a wooden palisaded fort in 1754, during the French and Indian War, only a single blockhouse survives. The oldest blockhouse in the United States, it is preserved as Fort Halifax State Historic Site, and is open to the public in the warmer months. The fort guarded Wabanaki canoe routes that reached to the St. Lawrence and Penobscot Valleys via the Chaudière-Kennebec and Sebasticook-Souadabscook rivers. The blockhouse was declared a National Historic Landmark and added to the National Register of Historic Places in 1968.

The Lockwood Mill Historic District encompasses the only major 19th-century mill complex in Waterville, Maine. Located south of the city's downtown, it was designed by (and named for) Amos D. Lockwood, a nationally known industrial designer of the period. Its #2 building was for 45 years home to the Hathaway Shirt Company. It was listed on the National Register of Historic Places in 2007.

The Redington Museum or Redington House is a historic house and museum in Waterville, Maine that is listed on the National Register of Historic Places. The museum is the headquarters of the Waterville Historical Society. Built in 1814, it is one of the best-preserved houses of the period in the city. It has served since 1924 as the museum and headquarters of the Waterville Historical Society, and was listed on the National Register of Historic Places in 1978.The museum is listed on the official website of the Maine Office of Tourism.

The Universalist Unitarian Church is a historic church on Silver Street and Elm Street in Waterville, Maine in the United States. Built in 1832 for a Universalist congregation founded in 1826, it is a prominent local example of transitional Federal-Gothic Revival architecture. It was listed on the National Register of Historic Places in 1978.

The Waterville Main Street Historic District encompasses the best-preserved portions of the historical commercial downtown area of Waterville, Maine. Developed most intensively in the late 19th and early 20th centuries, this area was the center of commerce for Waterville and the surrounding rural communities. It encompasses 25 properties on Main and Common Streets, including the Waterville Opera House and City Hall. It was listed on the National Register of Historic Places in 2012, and was slightly enlarged in 2016.

The Waterville Opera House and City Hall is a historic civic building at Castonguay Square (Common and Front Streets) in downtown Waterville, Maine. Built at the turn of the 20th century, it is one of a small number of multifunction civic buildings, housing both a live performance venue and municipal facilities, functions it continues to perform today. It was listed on the National Register of Historic Places in 1976.

The Alvin O. Lombard House is a historic house at 65 Elm Street in Waterville, Maine. Built in 1908, it is a distinctive local example of late Shingle style architecture. It is further notable as the home of inventor Alvin O. Lombard, who developed the Lombard Steam Log Hauler, an early commercial use of track-propelled vehicles. The house was listed on the National Register of Historic Places in 1982.

The First Baptist Church is a historic church at 1 Park Street (corner of Elm) in Waterville, Maine. Built in 1826, it is the city's oldest standing public building. It was renovated in 1875 to a design by Francis H. Fassett. It was listed on the National Register of Historic Places in 1976.

The Professional Building is a historic commercial building at 177-179 Main Street in Waterville, Maine. Built in 1923 to a design by Miller & Mayo of Portland, it is a rare early example of Art Deco architecture in the state. It was listed on the National Register of Historic Places in 1982.

The Waterville Public Library is the public library serving Waterville, Maine.

The Ticonic Footbridge, popularly known as the Two Cent Bridge or the Two Penny Bridge, is a suspension bridge that spans the Kennebec River between the city of Waterville and the town of Winslow in Kennebec County, Maine. It is one of the oldest surviving wire-cable steel suspension bridges and also is considered to be the last known extant toll footbridge in the United States.

The Old Waterville Post Office is a historic post office facility at 1 Post Office Square in central Waterville, Maine. Built in 1911, it is a fine local example of institutional Greek Revival architecture. It was listed on the National Register of Historic Places in 1977, and presently houses a restaurant and brewpub.