Over-the-Rhine neighborhood in Cincinnati, Ohio is on the 2006 "Most Endangered" list of the National Trust for Historic Preservation.
Photo: Cincinnati Preservation Association

Mission San Miguel Arcangel (1821), San Miguel, California.
Photo: Teresa Grimes

Small houses in Kenilworth, Illinois are threatened by encroaching "MacMansions."
Photo: Courtesy NTHP

Damage to one of many New Orleans neighborhoods.
Photo: Preservation Resource Center of New Orleans