Mary Ann Furnace Historic District

The Mary Ann Furnace Historic District, also known as Trexler's Furnace, is an historic iron plantation and national historic district located in Longswamp Township in Berks County, Pennsylvania.

It was listed on the National Register of Historic Places in 1991.

History and architectural features
This district encompasses five contributing buildings, one contributing site, and one contributing structure. They are the iron furnace stack (1789), a stone and frame bank barn (c. 1830-1860), the manager's house and office (c. 1830-1860), a blacksmith shop (1854), a charcoal house (c. 1850), a stone dam, and a small stone house (c. 1830-1850). The furnace remained in operation until 1869.

The historical district is commemorated by a historical marker that was erected in 1924. Today, it is owned by the Rohrbach family, which continues to keep the property as historical accurate as possible.

It was listed on the National Register of Historic Places in 1991.