Ground-Breaking Construction of the Statue of Liberty

What do the Eiffel Tower and the Statue of Liberty have in common?

For millennia, Stonehenge has amazed and confounded visitors and archaeologists alike.  The massive awe-inspiring circle of stones was obviously important to its prehistoric builders.  But what is it for?  How did they build it?  And why?

Ancient civilizations used advanced engineering techniques to access water for both health and luxury.

Did you know that the Hoover Dam supplies electricity to more than 20 million people? Get all the facts on this marvel of engineering.