This magnificent gothic structure—designated as a National Historic Landmark— stands out amidst the modern skyscrapers of Center City. 45-minute tours providing an interesting foray into one of the city’s most impressive structures are given Tuesday-Friday at 11 a.m., 2 p.m., and 3 p.m., as well as Saturday mornings at 10 a.m. and 11 a.m., except during July and August. Closed Mondays and Major Holidays.