A natural gas leak provides a flickering flame beneath a waterfall.

A coal fire has been burning underground here since 1896.

Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

More gold than anywhere else, ever.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This 19th century train workshop is a treasure trove of railroad history.

A landmark in the history of technology and computing is hidden in a tiny Baroque chapel.

A skeleton without arms watches over the side door of one of the most beautiful baroque temples in Mexico.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

This tiny square mile of Canadian sand was once considered the world's smallest desert.

These Stolpersteine located in Spain honor Republican soldiers who perished at the hands of Nazis after the fall of France.

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

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This enormous fish commemorates the unplanned release of brown trout into a Michigan river.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A sculpture of a salmon swimming through a brick building.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

This aluminum “stairway to heaven” has impaled at least a couple of birds.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

Frozen in Norway, vended in Singapore.

The world's only pure blue lizard lives exclusively on this secluded tropical island.

A unique attraction and museum dedicated to exploring iconic roadside structures.