• Closes when El Retiro closes for bad weather, since the way in is through the park
• Shut on weekends in August, the last two weekends of July, public holidays, Easter Thursday to Sunday, and December 24 and 31
• Borrow books, films and magazines at self-checkout machines, with 39 internet stations and free wifi

A public library in two pavilions of the Casa de Fieras, El Retiro's old zoo, built under King Fernando VII. Its 3,794 square meters on two floors include a children's room, a corner for pre-readers, a youth section and a room of books on nature and the environment.

It sits inside the park, so a library stop pairs easily with a run around Retiro.