The National Library of Spain. Visitors can use the metro line L4. Visitors can get off at the stations Metro Colón and Serrano. Visitors can also use the bus lines 1, 5, 9, 14, 19, 21, 27, 37, 45, 51,53, 74, 150, C03, N1, N4, N22, N23, N24, N25, N26.
