A modern reimagining of a medieval city gate.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

The world's first floating farm is staffed by one human, three robots, and 35 cows.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

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

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

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A lush indoor jungle fills this bustling Madrid transportation hub.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The last bastion of Roman presence north of the Alps looms over a German town.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

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

Budapest's Communist-era statues, banished to the suburbs.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

These massive moving sand dunes have swallowed an entire village and are still on the run.

This 13th century Gothic brick castle is the largest in the world by surface area.

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