Capital Gate Tower, Abu Dhabi.
In June 2010, the Guinness Book of World Records certified Capital Gate as the "World’s furthest leaning man-made tower." The new record shows that the Capital Gate tower has been built to lean 18 degrees westwards; more than four times that of the Leaning Tower of Suurhusen. Investigation and evaluation, which was made by a Guinness appointed awards committee, started in January 2010, when the exterior was completed.The gravitational pressure caused by the 18-degree incline is countered by a technique called "pre-cambered core", using a core of concrete reinforced with steel, with the core deliberately built slightly off-center. It is also anchored to the ground by 490 piles which are drilled 20–30 meters underground.