London has its own leaning tower, the clock tower that contains Big Ben at the Palace of Westminster.
(Seemingly, the 96-metre tall clock tower, which houses the bell originally nicknamed Big Ben, leans about 46 cm to the left of its peak. A construction expert said there was nothing to worry about, and it would take 10,000 years to reach an angle of concern. Well at least it's leaning to the left, and not to the right.)