Logan Square

Logan Circle, also known as Logan Square, is an open-space park in Center City Philadelphia's northwest quadrant and one of the five original planned squares laid out on the city grid. The centerpiece of the park is the Logan Circle, a circular area centered on a large water feature, bounded by a traffic circle carrying 19th Street and the Benjamin Franklin Parkway with connections to 18th and 20th streets to the east and west and Race and Vine Streets to the south and north.

The circle exists within the original bounds of the square; the names Logan Square and Logan Circle are used interchangeably when referring to the park. Originally "Northwest Square" in William Penn's 1684 plan for the city, the square was renamed in 1825 after Philadelphia statesman James Logan. The park is the focal point of the eponymous neighborhood.

Source: Wikipedia