Once grazing ground for cows and sheep, Philadelphia's most elegant square is reminiscent of a Parisian park. One of William Penn's original five city squares, the park was named in 1825 to honor David Rittenhouse, 18th-century astronomer, clock maker, and the first director of the United States Mint. Many of Philadelphia's celebrities have lived here. Extra paths were made for Dr. William White, a leader in beautifying the square, so he could walk directly from his home to the exclusive Rittenhouse Club across the square and lunch with author Henry James. Until 1950 town houses bordered the square, but they have now been replaced on three sides by swank apartment buildings and hotels. Some great houses remain, including the former residence of Henry P. McIlhenny on the southwest corner. If you want to join the office workers who have lunch-hour picnics in the park, you can find many eateries along Walnut, Sansom, and Chestnut streets east of the square. Or you can dine alfresco at one of several upscale open-air cafés across from the square on 18th Street between Locust and Walnut. The term "Rittenhouse Row" describes the greater Rittenhouse Square area, bordered by Pine, Market, 21st, and Broad streets.