Thinking of Italy's Pisa instantly conjures the image of its leaning tower – the famous, centuries-old architectural marvel that has mesmerized onlookers and remains a tourist attraction today.

Oh, the Leaning Tower of Pisa — so touristy and yet so fun. Each day, hordes of visitors come to the small northwestern Tuscan town of Pisa to take pictures "propping up" its tower. Some do it ...

The Leaning Tower of Pisa is recognized globally for its unique structure. We aren't used to seeing towers that look like they're falling over nor do we usually think to climb them.