The Statue of Liberty is not just a monument. It is, in fact, an iconic symbol of freedom that stands tall on Liberty Island, New York Harbor. It has been recognized as a UNESCO World Heritage Site as well as the National Register of Historic Places and holds sub-national designations in New Jersey and New York City. But how did it come to be?

What if the Leaning Tower of Pisa Straight fall? And what keeps it from falling? Was it ever straight, or is the tilt by design? Here's the story behind it all.

Discover the story behind the Great Wall of China and know the secrets of its construction: Why was it made? How long did it take? Was it worth it?