Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Stalactites and stalagmites in a beautifully lit cave.

A submerged archeological park still holds the wonders of a Roman Sodom.

A 16th-century horror show built in a lovely Italian garden.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Trek up this glacier before it disappears.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

Sleep in the hay, spin the wheel and eat grain pellets to your heart's delight.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Buddha and Jesus tower over this French mountainside headquarters of the Aumism religious cult.

This otherworldly French waterfall looks like its waters have turned to stone.

Folklore and history carved into Brittany's coast.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

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

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This collection of French root art looks like an indoor fairy wonderland.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

A unique underground structure dating back to the 1st century BC.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.