A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

Human-made caves excavated to hide a secret society of wealthy pagans.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

Thousands of well-dressed mummies below a monastery.

Pilgrimage site for star-crossed lovers.

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The deadliest diving spot in the world is also a stunning geological marvel.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

This striking statue brings a scene from the African savannah into central London.

A wellspring of creativity in an already artsy East London neighborhood.

Where's a guy to go after a long, hard day at work?

The pockmarks across the building's facade are remnants of the Blitz.

A mysterious shape catches the eye in this 16th-century painting.

A celebrated bandstand at the center of what was once the worst slum in London.