Beautiful libraries of the world
The Peabody Library, Baltimore (U.S.)
Gas lighting and iron created a new form of library in the nineteenth century: the iron stack hall. The Peabody Library (1878) in Baltimore is the best surviving example. Virtually everything in this picture-- the columns, the capitals, the balconies, the railings and the ceiling-- are made of iron. Hot air heating was supplied through grills in the floor. The use of iron also meant that the library could be built over a concert hall, the weight of the books supported on iron beams over the space below. If you are ever in Baltimore, be sure to add this to your list of sights to see.
Source: Huffington Post