One of Ireland's most infamous prisons for rebels including men, women and children.

Eighty million natural history specimens call this gargantuan museum home.

Five candy-colored villages on the Italian Riviera.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Venice's "Island of the Mad."

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

2300-year-old Roman road connecting the empire.

The world's largest reflecting pool is just two centimeters deep.

The video game-themed street art first popped up in the French city.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This historic streetcar system has been running since the 19th-century.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

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.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A lush indoor jungle fills this bustling Madrid transportation hub.

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