The Eighth Maine Regiment Memorial building is a substantial and finely detailed Shingle Style structure erected in 1891 by the Civil War veterans of the 8th Maine Regiment. Designed by the architectural firm of Fassett and Tompson, the shore-side building is located on the south side of Peaks Island, an island in Casco Bay that is a part of the City of Portland, Maine. Originally constructed to serve as the location of annual reunions, the building presently functions as a memorial structure, museum, and lodging facility. It is owned by the Eighth Maine Regiment Association, the members of which are descendants of the Civil War veterans who served in one of the eleven companies of the Regiment. The Eighth Maine Regiment Memorial was listed in the National Register of Historic Places in honor of its military associations, and as a entertainment and recreation facility used for specialized reunions from the end of the nineteenth century until the present.