Rittenhouse Square, at 18th and Walnut streets, has long been one of the city's swankiest addresses. The square's entrances, plaza, pool, and fountains were designed in 1913 by Paul Cret, one of the people responsible for the Benjamin Franklin Parkway. The square was named in honor of one of the city's 18th-century stars: David Rittenhouse, president of the American Philosophical Society and a professor of astronomy at the University of Pennsylvania. The first house facing the square was erected in 1840, soon to be followed by other grand mansions. Almost all the private homes are now gone, replaced by hotels, apartments, and cultural institutions, and elegant restaurants and stylish cafés dot the neighborhood. The former home of banker George Childs Drexel was transformed into the Curtis Institute, alma mater of Leonard Bernstein and Gian Carlo Menotti. The former Samuel Price Wetherill mansion is now the Philadelphia Art Alliance, sponsor of exhibitions, drama, dance, and literary events.

The area south and west of the square is still largely residential and lovely, with cupolas and balconies, hitching posts and stained-glass windows. You can also find some small shops and the Rosenbach Museum and Library. In the heart of the city there are green places, too. Peek in the streets behind these homes or through their wrought-iron gates and into well-tended gardens. On Delancey Place, blocks alternate narrow and wide. The wide blocks had the homes of the wealthy, and the smaller ones held dwellings for servants or horses (today these carriage houses are prized real estate).

Annual events include the extremely popular Rittenhouse Square Flower Show and the Fine Arts Annual, an outdoor juried art show.

Four blocks east of the square is the Avenue of the Arts, also known as Broad Street. "Let us entertain you" could be the theme of the ambitious cultural development project that has transformed North and South Broad Street from a commercial thoroughfare to a performing arts district. Dramatic performance spaces have been built, old landmarks have been refurbished, and South Broad Street has been spruced up with landscaping, cast-iron lighting fixtures, special architectural lighting of key buildings, and decorative sidewalk paving.