Kentucky environmental lawyer Sanders says National Trust for Historical Preservation lists 11 endangered sites for 2009.

The National Trust for Historic Preservation listed 11 sites in total:

Ames Shovel Shops, Easton, Mass.
Cast-Iron Architecture of Galveston, Texas
Century Plaza Hotel, Los Angeles, Calif.
Dorchester Academy, Midway, Ga.
Human Services Center, Yankton, S.D.
Lāna‘i City, Hawai‘i
The Manhattan Project’s Enola Gay Hangar, Wendover Airfield, Utah
Memorial Bridge, Portsmouth, N.H. to Kittery, Maine
Miami Marine Stadium, Virginia Key, Fla.
Mount Taylor, near Grants, N.M.
Unity Temple, Oak Park, Ill.

More information on these endangered historical sites can be found at http://blogs.nationaltrust.org/preservationnation/?p=4140