A 200-year-old collection of medical paraphernalia in a historic house.

One of Europe's largest supercomputers is housed inside of a disused chapel.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

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

The world's most elegant power lines.

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

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

Roman ruins top white travertine terraces formed by ancient hot springs.

The ancient latrines of the Greeks, in all their public glory.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Where commuters walk through remnants of an ancient Greek necropolis.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The Pope’s secret escape route.