Centennial Plaza is 100 meters squared, the distance of one of the most exciting track races in the Olympics. The official flag of the Olympic Games and 23 national flags surround the Plaza, representing previous host cities of the summer Games. Also surrounding the plaza are Willow Oak tree planters with engraved plaques honoring the 23 host cities of the first 100 years. Eight magnificent, 65-foot high lighted towers encircle the Plaza. Named after the mythological messenger god Hermes, the "Hermes Towers" are stylized reproductions of markers that led the ancient Greeks to significant public spaces and events.