Smithsonian Library in Smithsonian Institution Building West Wing, by Unknown, 1856, Smithsonian Archives - History Div, Engraving of the Smithsonian Library located in the West Wing of the Smithsonian Institution Building (SIB), or "Castle." The engraving shows balconies, which were erected in 1858, to provide additional space for books. The engraving was published in the Guidebook of 1857..