Pictures: 11 Most Endangered U.S. Historic Sites Named

Isaac Manchester Farm, Pennsylvania

Photograph by Gene J. Puskar, AP

Margie Manchester Pagliarulo stands on June 15 in front of the farmhouse her great-great-great-great-great-grandfather Isaac Manchester built more than 200 years ago in Avella, Pennsylvania.

The stately brick Georgian manor house and eight historic outbuildings represent a "remarkable, two-century time capsule, with objects and archival material preserved," according to the National Trust.

However, a coal company plans to mine near the property, which would jeopardize the farm's water supply. Mining infrastructure, such as access roads, will also threaten the farm's historic setting, the Trust says.

Published June 23, 2011