The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

The summit Roosevelt conquered before he descended to become The Chief.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

This historic stone bridge has an entire neighborhood clinging to its sides.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Mysterious rocks that ring musically when struck.

One man's swirling six-acre monument of stone.