This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

A sanctuary for sickly, stray, or wounded donkeys.

This isthmus in the Bahamas narrowly separates the roiling Atlantic from the cool Bight of Eleuthera.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Watch the newest land on the planet form before your eyes.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

This massive redwood tree has a hole in the base big enough to drive through.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

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

Along a California highway is a kind of Jurassic Park made of metal.

Over two-thirds of the world's population of giant tortoises live among this coral formation.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A musical instrument played by the sea.