César Pelli designed an office building in this city that has a six-sided roof without right angles. This city’s Guild House and Vanna Venturi house are early examples of postmodern architecture. This city’s Cira Centre is located behind its 30th Street Station. Rafael Viñoly designed a building in this city with a vaulted glass ceiling that contains Verizon Hall and Perelman Theater. This city’s Kimmel Center is home to its “Big Five” orchestra directed by Yannick Nézet-Séguin (“ya-NEEK nay-ZAY say-GAN”). In this city, the Comcast Center is located in Center City, which is separated from University City by the Schuylkill (“SKOO-kull”) River. This city’s Rittenhouse Square was planned by William Penn. For 10 points, name this city, the location of Independence Hall and the Liberty Bell. ■END■