One of the largest Buddhist stupas in the world keeps an eye out in every direction.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

360° views of the city plus five floors of optical illusions and hands-on science.

This artistic fountain display pays homage to this area's theatrical history.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The way that light hits a stained glass window on a specific day is one of many "clues" to a mysterious treasure.

Historic medieval fortified city in southwest France.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

The site of the first medieval crusade that pitted Christians against Christians.

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

French commune at the heart of conspiracies.

Small French town or alien garage?

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

This museum contains a vast array of puppets and marionettes from all over the world, featuring incredible works by Portuguese creators.

A cluster of granite granaries perched on stilts.

Elaborate tile work in this railway station tells the story of Portugal.