It would take 35 firetrucks to fill this enormous glacial pothole.

The abandoned coal loading dock is a canvas for unsanctioned art.

Yo, Adrian!

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

A failed piece of Orientalism has become the proud symbol of a community.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The graffitied ruins stand hidden within the Pennsylvania woods.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

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

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The world’s first penitentiary, meant to be humane, drove men insane.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

A sparkling sandstone cliffside that's worth a visit while it still exists.

Nature is leading a successful mutiny on this century-old freighter.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.