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).
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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.
Courtesy CMT Group/National Trust for Historic Preservation
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."
Courtesy National Trust for Historic Preservation
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.
Courtesy BVH Architecture/National Trust for Historic Preservation
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.
Courtesy Gerville Larsen/National Trust for Historic Preservation
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.
Courtesy Mississippi Heritage Trust/National Trust for Historic Preservation
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."
Courtesy National Trust for Historic 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.
Courtesy Jordan Sorenson/National Trust for Historic Preservation
Route 66: The internationally famous Route 66 symbolizes the United States' love of the open road.
Courtesy Carol Highsmith/LOC/National Trust for Historic Preservation
Ship on the Desert -- Salt Flat, Texas: This early Modernist house located in Guadalupe Mountains National Park in West Texas suffers from neglect.
Courtesy Julie McGilvray/National Trust for Historic Preservation
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).
Courtesy LA Conservancy/National Trust for Historic Preservation
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.