Pisa - Leaning tower
The Leaning Tower of Pisa (Italian: Torre pendente di Pisa) or simply the Tower of Pisa (La Torre di Pisa) is the campanile, or freestanding bell tower. The top of the Leaning Tower can be reached by mounting the 294 steps which rise in the form of a spiral on the inner side of the tower walls. Although intended to stand vertically, the tower began leaning to the southeast soon after the onset of construction in 1173 due to a poorly laid foundation and loose substrate that has allowed the foundation to shift direction. The tower currently leans to the southwest.