Oak Park expanded its Frank Lloyd Wright Historic District boundaries recently, adding 444 homes to the area once declared one of America’s 10 great neighborhoods. The expansion brings the total number of homes in the district to 1,934. Of those, 1,728 homes – or 89 percent – are considered historically relevant to the area. Click here to read the full story. Many of the homes are showcased each year in the Frank Lloyd Wright Preservation Trust's annual housewalk. These photos show homes featured in past tours; click here for information about the 2012 housewalk, which is set for June 2.