This secluded bay on the island of Poros is a magnificent snorkelling site with an archaeological secret.

The site where the summer solstice helped ancient Greeks sync the lunar and solar calendars.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The huge golden reliquary of a testicle-smashing saint.

A Gothic cathedral created from volcanic rocks.

Reminiscent of a termite mound, this imposing structure is likely an ancient funerary monument.

Site of one of World War I's most horrific scenes.

A swath of France so devastated by war it is still forbidden to go there.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

Statue of a decomposing prince that once held his heart in its hand.

A tiny art gallery where artists can donate their work for the public to take and enjoy.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

A bridge that has seen many reiterations over its lifetime.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

This kaleidoscopic house may be the most bizarre on the island of Fuerteventura.

Park in the Canary Islands renowned for white dunes that contrast with the turquoise waters of the Atlantic.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This artificial ring island was built to hold cubic tons of polluted dirt.

Rest stops along this pathway offer some of the best views of the Acropolis of Athens.

A preserved building where the dead were once watched for signs of life.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

After witnessing the rise and fall of three empires, this ancient city was finally destroyed by a series of earthquakes.