The Pope’s secret escape route.

Amsterdam's former hotspot for public executions and dissections.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Cat art as far as the eye can see.

The history and future of cannabis.

A statue of a boy looks up at where the famous rival to the Leaning Tower of Pisa once stood.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

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.

Giant topiary dog once played a role in a terrorist bomb plot.

Spain's stunning solar energy plant.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The world's largest wooden structure.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

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

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

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.