A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A sharp bend in a dramatic river canyon cut through red rocks.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A field of nothing but boulders which resembles a giant's gravel driveway.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

A toxic ghost town sitting atop a massive coal fire.

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

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.

Astounding collection of coin-operated games and automata.

A replica that won't float away.

A botanic garden full of trees twisted into fantastic shapes and positions.

Is this the most Portland place ever?

This abandoned boat was left in place thanks to its rotting beauty.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A beautiful geyser under environmental threat.

Piled high inside this warehouse and coffee shop are salvaged goods that span every corner of the globe.

An impressive collection of farm equipment and other artifacts from life on the prairie.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This beautiful architectural gem was the first waste treatment facility in Boston.

Rare recess caves fill this unbelievably beautiful Ohio park.