CARLOS DOMINGUEZ / SCIENCE PHOTO LIBRARY CARLOS DOMINGUEZ / SCIENCE PHOTO LIBRARY
CTBA skyscrapers, Madrid, Spain. These are two of the four skyscrapers in the CTBA (Cuatro Torres Business Area) in Madrid, Spain. They are the Torre de Cristal (left, 249.5 metres) and the Torre Espacio (right, 224.5 metres). Along with two other nearby skyscrapers, they are collectively known as Cuatro Torres (the Four Towers), and the business area is named after them. They are the tallest skyscrapers in Madrid, and were completed between 2007 and 2008. Photographed in 2011.
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