This undated image provided by Alan C. Spector via the National Trust for Historic Preservation shows Frank Lloyd Wright�s Spring House in Tallahassee, Fla., one of America's 11 most endangered historic places. Designed by Frank Lloyd Wright and constructed in 1954, Spring House is the only built private residence designed by Wright in Florida. Its novel �hemicycle� form is one of very few surviving homes that Wright designed in this style. Preservationists say weather and the ravages of time have deteriorated the building. (AP Photo/National Trust for Historic Preservation)