The Leaning Tower of Pisa in Pisa, Italy

The Leaning Tower of Pisa (Italian: Torre pendente di Pisa [ˈtorre penˈdɛnte di ˈpiːza, - ˈpiːsa], or simply the Tower of Pisa (Torre di Pisa), is the campanile, or freestanding bell tower, of Pisa Cathedral. It is known for its nearly four-degree lean, resulting from an unstable foundation. The tower is one of three structures in Pisa's Cathedral Square (Piazza del Duomo), which includes the cathedral and Pisa Baptistry.

The height of the tower is 55.86 meters (183 feet 3 inches) from the ground on the low side and 56.67 m (185 ft 11 in) on the high side. The width of the walls at the base is 2.44 m (8 ft 0 in). Its weight is estimated at 14,500 tones (16,000 short tons). The tower has 296 or 294 steps; the seventh floor has two fewer steps on the north-facing staircase.

Thanks to Google Earth Studio for this amazing aerial view.