Home to the world's oldest functioning orrery.

The world's largest reflecting pool is just two centimeters deep.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

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

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

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

Single runway interrupted by a busy road that cuts across its middle.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

Stunning Roman aqueduct used for 1900 years and still standing.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

A miniature city, once ruled by the Queen of the Netherlands.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Folklore and history carved into Brittany's coast.

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