A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A sprawling collection of over 106,000 toys from around the world.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

A rusted metal giant pays tribute to Birmingham’s industrial past.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

One of the last active volcanoes on the Eastern seaboard.

A man-made island in scenic San Francisco Bay.

Playable, historic pinball machines fill this Alameda museum.

The bones of an old zoo crumbling in the shadow of a new one.

New England's tallest light house stands on an island with a history of cannibalism and death.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

A miraculous natural phenomenon known as "the spring that breathes."

On a barren hillside in the Yucca Valley, the recently restored Desert Christ Park has attracted pilgrims and kitsch hunters for over 50 years.

The only road through the heart of Glacier National Park.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.