The BPL is actually two libraries. The original structure, designed by Charles McKim and completed in 1895, is now the research library, while an extension opened in 1972 to function as a general library. Frequented by local students and casual book-browsers, the complex is well worth visiting. Most days you can join an informal art and architecture tour conducted by volunteers (call for times), but the labyrinthine structure is a joy to get lost in as well. At the center of the building is the cloistered courtyard, with its central fountain—a tranquil place to linger. Another highlight is John Singer Sargent's recently restored epic mural, the Triumph of Religion, which dominates the third floor gallery.