A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A building so large that it has its own weather.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Northern Ireland's Brobdingnagian stepping stones.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Community bookshelf of 25-foot-tall book spines.

Sausages, schnitzel, and weiners.

Peace Park and the Atomic Bomb Dome.

The glowing blue Nymphaeum of Emperor Tiberius.

America's only nuclear missile silo open to the public.

The short-lived history of a new republic and British control in West Florida.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The only road through the heart of Glacier National Park.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

Fossils, railroads, and waterfalls!

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

A real flying saucer, contracted by the U.S. Air Force.