Philadelphia Museum of Art

Legions of film fans know it for "the famous steps Rocky ran up", but this "top-notch" art museum in Center City is "even more impressive" for what it contains: a "beautiful and diverse collection" ranging from "a room of armor" to a "Japanese teahouse" to "important" modern art (including a large Marcel Duchamp collection), all in a "gorgeous" neoclassical building with "sculptures strewn" outside and a Sunday policy of pay-what-you-wish; N.B. a new art deco building across the street houses more galleries and a library.