The Leaning Tower of Pisa
The Tower of Pisa is the bell tower of the Cathedral. Its construction began in the August of 1173 and continued (with two long interruptions) for about two hundred years, in full fidelity to the original project, whose architect is still uncertain. It is situated behind the cathedral and is the third oldest structure in Pisa's Piazza del Duomo (Cathedral Square) after the cathedral and the baptistry.
In the past it was widely believed that the inclination of the Tower was part of the project ever since its beginning, but now we know that it is not so. The Tower was designed to be "vertical" 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 presently leans to the southwest.
Now, hundreds & thousands of travelers each day go there to view and admire the historic relics, of course they are also deeply attracted by the civilization of ancient Roma.
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Photo credits: Toneimage.