Since 1988, 11 Most list has served as a powerful alarm to raise awareness of the serious threats facing some of America's most significant historic placesWASHINGTON, Dec. 5, 2012 /PRNewswire-USNewswire/ -- The National Trust for Historic Preservation is accepting nominations for its annual list of America's 11 Most Endangered Historic Places®. For over a quarter century, this list has highlighted important examples of the nation's architectural, cultural and natural heritage that are at risk for destruction or irreparable damage. Nominations are due on March 1, 2013. The 2013 list will be announced in June. "Historic places are a tangible reminder of who we are as a nation," said Stephanie Meeks, president of the National Trust for Historic Preservation. "For over 25 years, the National Trust's list of America's 11 Most Endangered Historic Places has helped shine a spotlight on threatened historic places throughout the nation, helping not only to preserve these places, but also galvanizing local support for the preservation of other unique, irreplaceable treasures that make our nation and local communities special." More than 240 threatened one-of-a-kind historic treasures have been identified on the list of America's 11 Most Endangered Historic Places since 1988. Whether these sites are urban districts or rural landscapes, Native American landmarks or 20th-century sports arenas, entire communities or single buildings, the list spotlights historic places across America that are facing a range of threats including insufficient funds, inappropriate development or insensitive public policy. The designation has been a powerful tool for raising awareness and rallying resources to save endangered sites from every region of the country. The places on the list need not be famous, but they must be significant within their own cultural context, illustrate important issues in preservation and have a need for immediate action to stop or reverse serious threats. All nominations are subject to an extensive, rigorous vetting process.