Windows on the World was a complex of venues on the top floors (106th and 107th) of the North Tower (Building One) of the original World Trade Center complex in Lower Manhattan. It included a restaurant called Windows on the World, a smaller restaurant called Wild Blue, a bar called The Greatest Bar on Earth, and rooms for private functions. Developed by restaurateur Joe Baum and designed initially by Warren Platner, Windows on the World occupied 50,000 square feet (4,600 m2) of space in the North Tower. The restaurants opened on April 19, 1976, and were destroyed in the September 11 attacks.