Four giants under the fog
These four skyscrapers constitute a business complex accomodating mostly offices, but there are also services such as a hotel and a garden. Furthermore, each tower has several underground levels for parking and road access. The construction of these four buildings began in 2004 and work was completed in 2008. Over 820 feet high (248 meters!!), the Caja Madrid Tower is the tallest of the complex, and in Spain as well. It was designed by Norman Foster. The floors are organized in the same manner as a bookcase.