Musée Culturel du Mont-Carmel, Historical church museum in Grand Isle, United States

The Musée Culturel du Mont-Carmel is housed in a former Catholic church building featuring two square towers, Corinthian columns, and a Baroque dome overhead. The structure displays classical religious architecture with a steeply pitched gable roof and now serves as a cultural museum for the community.

Acadians settled the upper Saint John River valley in the late 18th century, before the 1842 Webster-Ashburton Treaty fixed the Maine–New Brunswick border and split the community. A first church was built in 1848; the present building was erected in 1908–09 by Léonide Gagné, with a Roman basilica interior by Montréal architect Théophile Daoust, and held its first Mass on New Year's Day 1910. Closed in 1978, it was acquired by a non-profit in 1984 and restored as a museum.

The museum's collection covers Acadian daily life and the history of Acadia, the territory that once spanned both sides of today's Canada–US border. It is run by the Madawaska Historical Society with Maine Acadian Culture and the National Park Service, and hosts cultural events.

The museum operates seasonally from mid-June through Labor Day and provides guided tours along with educational programs. Visitors should plan ahead since the space follows a summer schedule and may have limited weekday hours.

The church was built in 1908–09 by Léonide Gagné, and its Roman basilica-style interior was designed by Montréal architect Théophile Daoust. It held its first Mass on New Year's Day 1910. After closing in 1978, legal action blocked maintenance or rehabilitation until 1983, when a non-profit acquired it from the diocese.