New York state alone is shutting down dozens of parks and sites, including abolitionist John Brown's farm where he is buried. It has been open to the public since 1895.
The National Trust for Historic Preservation also lists 10 other sites as endangered Wednesday. One is Virginia's Wilderness Battlefield where Robert E. Lee and Ulysses S. Grant first met in the Civil War. Preservationists are fighting Wal-Mart's plan to build a store nearby.
Among the others: