Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

A fake medieval village in the middle of Turin.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

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

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.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The bronze uniforms commemorate the vital role of women during World War II.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

A hands-off space for graffiti artists to hone and display their skills.

The most impressive of Basel's three remaining city gates.

This artistic fountain display pays homage to this area's theatrical history.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.