"Painted Ladies" is a term used to describe Victorian or Edwardian style homes painted in 3 different colors (usually bright colors) to accentuate the architecture. The most famous "row" of painted ladies resides in San Francisco; however, St. Louis' Lafayette Square can certainly hold it's own (pictured above). These are located on Hickory St. just north of Lafayette Park. You may also find such homes in Baltimore, MD, Cape May, NJ, New Orleans, LA, and Cincinnati, OH.
Lafayette Square is one of my favorite neighborhoods in all of St. Louis, MO. You can expect to see and learn more about this neighborhood in the future.