The Knox Memorial was reconstructed as a museum by the Knox Memorial Association in 1929. The original Federal style Montpelier Mansion was built in Thomaston in 1795 for retired Revolutionary War Major General Henry Knox, first U.S. Secretary of War, to live with his family. The nineteen-room mansion was built on land inherited by Knox’s wife, Lucy. The building was razed in 1871 after the death all Knox family members. The plans for the reconstruction utilized correspondence between Knox and the designer Ebenezer Dunton and diary entries from visitors the original mansion. Family relics that had been purchased by locals were largely returned to the site, and the Knox Memorial Association worked with landscape architect Hans Heistad to create a Colonial revival landscape around the museum.

The caption reads, "Knox Memorial, Thomaston, Maine."

The Tichnor Brothers printing company published this type of postcard circa 1938.