An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This modest marker near Notre Dame identifies the very center of Paris.

Paris' linguistic guide to the international language of, yes, love.

This fortress was built using the last surviving stones from the Lighthouse of Alexandria, one of the Seven Wonders of the Ancient World.

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

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

An unusual double-stelae obelisk with ancient and mysterious origins.

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Shop at the 200-year-old store where Julia Child stocked up on copper cookware.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

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

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

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

The narrowest street in Paris.

Marie Antoinette and Napoleon Bonaparte were fans of this 200-year-old French chocolatier.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

A small but very fascinating fountain in the center of Rome with four books and a deer carved.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Inside the world's largest seed bank, WWII botanists elected to starve to death rather than compromise their collection.

Eat the ultimate iteration of Portugal's most beloved pastry.

Order a boozy baba au rhum at the oldest patisserie in Paris.