One architect's organic, human-centric design has been fully realized in this alien art house.

Avant garde house of Pierre Cardin on the Cote d’Azur.

The ruins stand as a somber reminder of France’s worst civil catastrophe of the 20th century.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

Longest canal tunnel in the world, abandoned in the 1960s.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

The largest underground church in Europe.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

This is what trains will look like after the zombie apocalypse.

The stone that rocks no more.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

This rustic, flower-lined pathway once had very little in common with its namesake.

This gnarled old tree supposedly sprouted from seeds kept in the pocket of a 16th-century Spanish sailor.

These unknown Bronze Age earthworks are believed to be ancient burial mounds.

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

Amazing vistas await visitors to this stretch of coastline.

This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

Beautiful scenery provides the backdrop for an abandoned coastguard facility.

The lake that fills and empties itself at random.

The atmospheric road was never meant to be so creepy.