
Mount Vernon and Piscataway National Park -- Mount Vernon, Virginia and Accokeek, Maryland: The National Trust for Historic Preservation has released its 2018 list of America's most endangered historic places, including George Washington's plantation house, Mount Vernon (pictured).

Annapolis City Dock Area -- Annapolis, Maryland: A proposal to re-zone portions of the Colonial Annapolis Historic District would damage the area's "quality of life and heritage tourism economy" and "permanently diminish its charm and unparalleled views," the trust says.

Ashley River Historic District -- Charleston County, South Carolina: This South Carolina Lowcountry district has a complex history that the trust says is "threatened by an annexation proposal that could lead to zoning changes and intensive development."

Dr. Susan LaFlesche Picotte Memorial Hospital -- Walthill, Nebraska: This building may have been the first hospital constructed for any Native American reservation without federal funding.

Historic Resources of Puerto Rico and the US Virgin Islands: Thousands of historic and cultural resources throughout Puerto Rico and the US Virgin Islands were damaged in the 2017 hurricanes.

Isaiah T. Montgomery House -- Mound Bayou, Mississippi: One of the earliest all-black municipalities, Mound Bayou was established by former enslaved person Isaiah T. Montgomery after the Civil War.

Larimer Square -- Denver, Colorado: Denver's first commercial block and first historic district, the trust says Larimer Square has stood as a national model "for revitalizing neighborhoods through preservation."

Mary and Eliza Freeman Houses -- Bridgeport, Connecticut: The Freeman Houses, which may be the oldest African American-built houses in Connecticut, have been vacant for years.

Route 66: The internationally famous Route 66 symbolizes the United States' love of the open road.

Ship on the Desert -- Salt Flat, Texas: This early Modernist house located in Guadalupe Mountains National Park in West Texas suffers from neglect.

Walkout Schools of Los Angeles -- Los Angeles, California: East LA's "Walkout Schools" consist of five historic school campuses that were instrumental locations in the 1968 East L.A. Chicano Student Walkouts, including Theodore Roosevelt High School (pictured).

Four Towns of Vermont's Upper Valley -- Royalton, Sharon, Strafford and Tunbridge, Vermont: We do know how to count to 11, but the National Trust placed this site on "watch status" to raise awareness about the potential threats facing the Upper Valley. Locals fear a new multibillion dollar housing proposal would negatively impact the character of this rural community.



