Vicious dogs and buried hazards hinder the dig for relics from the Motor City's historic boom and American Savage's profit.

Hunting for 19th century privy sites involves winning over the though locals, cutting through concrete and digging up to 30 feet down.

Extraordinary feats of construction, created without the use of advanced tools or technology, can be found from the jungles of Costa Rica to England's rural countryside.

Charting the progress of different ice ages through the history of Earth and examining when the next one is due.

How the U.S. is divided politically and what happens to the states caught in the middle.

The Civil War turned Washington, D.C., into a symbol of the American people and their government.