Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

See what remains of a once grand ancient Roman circus.

The secret medieval communication system will whisk your words above the noise of the crowd.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

An unusual resting place built into the hill with an amazing view of Lake Como.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

An ancient artistic garden parlor full of hidden water wonders.

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

The abandoned Bermudian home of a British naval leader is surrounded by crumbling sporting fields and the graves of convicts.

So many migrating birds roost on the bridge, it has a special summer speed limit.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

An abandoned asylum where patients have been forgotten but their possessions remain.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

The ruined remains of a coal mining ghost town are hidden within the woods.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The largest known open fault in the United States is basically a giant natural refrigerator.

A winding, cliffside stretch of road overlooking the Delaware River.

America's first serial killer rests in anonymity.