The Puerta de Europa towers (Gate of Europe or Europe's Gate or just Torres KIO) are two twin office buildings in Madrid. They were commissioned in 1996 by the Kuwait Investments Office (hence their initial name "Torres KIO") and designed by the American architects Philip Johnson and John Burgee.
Each building is 115 m tall with an inclination of 15º. They are located near the Chamartín railway station, on the sides of the Plaza Castilla bus station, north from the Paseo de la Castellana and near the Cuatro Torres skyscraper park.
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