This building played host to some of the most influential minds of the Industrial Revolution and now serves as a reminder of the influence of Northern coalfields.

The last gas-lit cinema in the United Kingdom, and perhaps the world.

The former home of one of the U.K.’s most notable families of suffragettes is now a museum dedicated to women’s rights.

This castle was once an Italian horror cinema star.

Ornamented with "Bristol Diamonds," this exotic shell grotto is considered to be the finest surviving example from the eighteenth century.

This futuristic-looking museum was built for the centennial of Japan's most innovative toilet.

Though they look like Hobbit houses, these semi-underground stone structures were built for winemaking.

This cave at the base of an unusually shaped cliff is said to be inhabited by a mythical forest enchantres from Scandinavian folklore.

A hidden alley with seven corners and handmade cat decorations.

The lighthouse is on a island which is connected to another island, which is connected to another island, which is connected to one of the largest islands in the world.

Inside a Scottish castle hangs the tattered remains of a flag with murky origins and supposed magic powers.

The largest public library in the United Kingdom was designed to reflect the industrial and artistic history of the city where it stands.

This ruined castle is said to be the legendary keep of a Viking princess.

Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

When the city of Manchester built a new centralized heating network, they did it with style.

For centuries, this town's hot springs have been embraced by rich and poor—and even by Popes.

On market days, a tax collector sat in a small cave at the end of this arched bridge.

For many years, the origin of these enigmatic artificial caves was the subject of debate among historians.

An archway adorned with vulnerable flora and fauna.

Built in 1925, this glass-roofed shopping arcade is known for its modernist Italian architecture.

Enormous crabs, bioluminescent jellies, and other amazing creatures from the ocean’s depths—some of which are in an aquarium for the first time ever.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

You'll need a microscope to see some of the minuscule masterpieces in this modest museum.

A dilapidated space station with overtones of 'Alien' and 'Bladerunner' featuring a multiplayer games galore.