As awesome as it would be, The Leaning Tower of Pizza, does not exist. The Leaning Tower of Pisa, though, is located in Pisa, Italy (Western Italy), and though not made of pizza, is still pretty cool.
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.
Prior to restoration work performed between 1990 and 2001, the tower leaned at an angle of 5.5 degrees, but the tower now leans at about 3.99 degrees to the southwest.