Yahoo, the Capital Gate building in Abu Dhabi, was recently certified as being the "World's Furthest Leaning Man-made Tower" by Guinness World Records, according to reports. The building leans at 18 degrees, which is nearly five times that of the Leaning Tower of Pisa, which leans at 4 degrees.
However, unlike the Tower of Pisa, the 35-story, 525-foot Capital Gate tower was built to lean 18 degrees westward. So, how did they do it? According to Abu Dhabi National Exhibitions Company, who developed the tower, the building's floor plates are stacked vertically until the 12th floor, after which point they are "staggered over each other by between 300mm to 1400mm." ADNEC says Capital Gate also features "the world's first known use of a 'pre-cambered' core, which contains more than 15,000 cubic meters of concrete reinforced with 10,000 tons of steel."