This unreal Portuguese palace looks as though it's made from a pile of different castles.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

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

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Abandoned bridge hidden deep in the San Gabriel Mountains.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A 18th century graveyard and its astonishing cortege of macabre iconography.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Famously misunderstood wonder of the ancient world

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The fairy tale castle of the "fairy-tale king."

The vast, legendary catacombs hold secrets much stranger than stacked bones.