Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The world's largest wooden structure.

An eerie collection of the surviving structures from a past celebration of the future.

Spain's largest bullring offers a unique glimpse at architecture and history.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

Come for the bread-themed puppet show, stay for the buffet.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

One of the largest Roman settlements in Portugal.

The "Little Ones," show Portugal in full miniature splendor.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A unique seaside cave where Aleister Crowley faked his own death.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

One man's remarkable private collection of art from around the world.

This now abandoned restaurant provides some of the most amazing views of Lisboa.