A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

The site where hundreds of Greeks were tortured by the Nazi secret police is now a cosmetics store.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The decaying ruins of Wales' first asylum for the mentally ill.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Medicinal spa created with the discharge from a geothermal energy plant.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

It's good luck to be mocked by this monkey.

This stunning concert hall has become a symbol of Iceland's national recovery.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This tiny museum's sizable collection is jammed into a former underground public toilet.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

Fantastic views and thousands of love locks.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.