This Parisian gem is one of the most incredible ethnographic museums in the world.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

What started as a way to address damp basement walls turned into a house filled with intricate hand-carved designs.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

A stunning Victorian abbey and walled garden on a lakefront.

The world's tallest box hedge is found in a delightful garden.

Experience what life was like in Ireland during the Viking and medieval ages.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The abandoned fishing village was swept right into the sea.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

The remains of centuries of copper mining appear like an alien landscape.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

A sweet symbol marks the place where torturous executions were once carried out.

One of the highest Roman forts in Britain is set amid dramatic scenery on a notoriously difficult road.

This library dates back to the late 17th century and was one of the first public lending libraries in England.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.