Rittenhouse Square is one of the five original open-space parks planned by William Penn and his surveyor Thomas Holme during the late 17th century in central Philadelphia, Pennsylvania. Rittenhouse Square is the site of annual flower markets and outdoor art exhibitions. More than any of the other squares, it also functions as a neighborhood park. Office workers eat their lunches on the benches; parents bring children to play; and many people stroll through to admire the plants or sculptures.