This is the oldest Roman-made bridge in the city still existing in its original state.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

Twisted buildings adorn the banks of the Rhine river.

A fairy tale castle in modern Rome.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Model Trains and Much More in Hamburg.

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

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

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

An exotic wildlife habitat right off The Strip.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

This 600-year-old home seems to defy physics.

An early 20th-century bullring converted into a modern shopping center.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

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.

Week-long block party becomes a competition for the best decorated street.

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

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

Hamburgers are intensely proud of their tunnel beneath the river.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

An abandoned underground bathroom is now a space for public art.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.