From either Logan Circle or the museums on the left side of the Parkway (facing the Art Museum), cross back to the right side to the Central branch of the Free Library of Philadelphia (Vine Street and 19th Street, just off the Parkway). Check out the Shakespeare Memorial sculpture (1929) by Alexander Stirling Calder in the grassy area in front.
The library opened in 1927 and contains more than seven million items and special collections. The Beaux Arts building has 20 different signs posted that describe each space and its history. Visit the Rare Books Collection for a tour if time allows.