The Puerta de Europa (Gate of Europe), which make these two buildings, formerly called Kio Towers, because they were initially owned by the Kuwait Investments Office.
They are the first leaning skyscrapers built in the world, designed and constructed by the two American architects Philip Johnson and John Burgee
They are in Plaza Castilla, on one of the main Madrilian avenues, La Castellana.
Its main characteristic is the 15 ° angle, with respect to the vertical. With its 114 meters, and 30 floors high, it occupies the 10 and 11th position, within the tallest buildings in Madrid.
In the background of the above photo, you can see part of the four CTBA towers, which are the tallest buildings in Spain.