The Leaning Tower of Pisa is the freestanding bell tower of the cathedral of the Italian city of Pisa. Situated behind the cathedral, it is the third structure in Pisa's Campo dei Miracoli, or the field of miracles. The tower began leaning to the southeast after construction started in 1173 due to a poorly-laid foundation. The height of the tower is 183.27 feet from the ground on the lowest side and 186.02 feet on the highest side. It has 294 steps. The tower leans at an angle of 5.5 degrees and weighs around 14,500 tonnes. It's not possible anymore to climb the tower.