The Dipòsit de les Aigües Library, Universitat Pompeu Fabra, Barcelona, Catalonia.
This library is set up in a 19th-century water reservoir located in the heart of Barcelona. After 100 years of different uses -old people's home, storage for the fire brigade, car park for the local police department, archive for the Court of Justice- it became property of the Pompeu Fabra University in 1992. Since then, it's the university's library.
Photos by Arq Foto, Burçin Yildirim on Flickr, and The ISA Journal.