A list of listing buildings

THE British Parliament's Clock Tower (more commonly known as Big Ben) is leaning north-west by 0.26 degrees, or 17 inches (43.5cm), according to documents that were recently made public. But Big Ben isn't alone; architects have been correcting the Leaning Tower of Pisa since the 1170s when it was still being built. Germany's Leaning Tower of Suurhusen, which at an angle of 5.19 degrees holds the Guinness World Record for the most tilted tower in the world, dates back to the 1450s. In modern times, many buildings have been designed at a deliberate slant. The 165-metre Montréal Tower, finished in 1987, is the world's tallest man-made leaning tower and inclines at a 45-degree angle. In 1996, the Puerta de Europa in Spain was completed with two towers sloping towards each other at a 15-degree angle. Late this year the Capital Gate is set to be finished in Abu Dhabi at a slant of 18 degrees.

Clarification: The Montréal Tower was finished in 1987, not built then, as we originally stated. This was changed on October 25th 2011.