National Open House: Season 3 - 13 Episode s
3x1 - Minneapolis, Charleston, San Francisco
3x2 - Dallas, San Francisco, Maui
3x3 - Louisville, Philadelphia, Maui
3x4 - Los Angeles, Dallas, Chicago
3x5 - Louisville, Boulder, Chicago
3x6 - Boulder, Charleston, Los Angeles
3x7 - Boulder, New York City, Indianapolis
3x8 - New York City, Santa Fe, Boise
3x9 - Princeton, Boise, Minneapolis
3x10 - St. Louis, Princeton, Santa Fe
June 4, 2007
3x11 - Hot Springs, Bradenton, Ithaca
June 11, 2007
3x12 - Dallas, Ithaca, St. Louis
June 18, 2007
3x13 - Bradenton, Minneapolis, Philadelphia