The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

Historians and hobbyists head to this former French outpost for the annual Feast of the Hunters' Moon.

Ornate limestone building now filled with geologic specimens, and more.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

One of Ireland's most infamous prisons for rebels including men, women and children.

The most magnificent bottle house in a town strangely full of them.

Marta Becket's hand-painted theater in the desert.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Odd outsider art installations surround a Gold Rush-era ghost town.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

A frozen oasis lies beneath the scorching New Mexico desert.

A tunnel with windows, so you don't miss out on the impressive views.

Abandoned silver mine strewn with wrecked and twisted structures.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Possibly the world's only drive-in movie theater with an attached motel.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

When ecosystems collide in the arid Southwest.

The largest source of fossilized insects anywhere.

The highest bridge in America was built for an almost unnervingly small amount of money.