Most of the historic cathedrals and places of worship throughout the city are open to the public free of charge, including Arch Street Friends Meeting House, Old Pine Street Presbyterian, and Mother Bethel A.M.E.
Pay whatever you wish (zero is a number too) at the Philadelphia Museum of Art, including the Perelman Building, on the first Sunday of each month, and at the Independence Seaport Museum every Sunday 10 a.m.–noon.
The University Museum of Archaeology and Anthropology is free during the last hour of each day, and the Fairmount Waterworks Interpretive Center and the Institute of Contemporary Art are always free. At the Rodin Museum, a $5 donation is suggested but not required.
Most of the city’s art galleries are free, including the Morris Gallery and ground floor of the Pennsylvania Academy of the Fine Arts, which presents rotating exhibitions of regional artists. The best time to visit the smaller galleries, mostly located in Old City and Northern Liberties, is on the First Friday of the month, when they are open to the public, many with the added lure of snacks and wine, which are also free.
Excerpted from the Second Edition of Moon Philadelphia.