Gay Head Lighthouse - Martha's Vineyard, Mass. Pictures - CBS News President Barack Obama, left, walks around Gay Head Lighthouse while on vacation on Martha's Vineyard in Aquinnah, Mass., Aug. 27, 2009. The lighthouse is on The National Trust for Historic Preservation 2013 list of 11 Most Endangered Historic Places. It was the first lighthouse built on Martha's Vineyard in Massachusetts and now is in danger of toppling over the edge of the Gay Head Cliffs. Preservationists say it's threatened by a century of erosion at the oceanfront site and the impacts of climate change. Credit: Alex Brandon/AP