An existential riddle in the world's largest ancient castle.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

A mechanized clock where a man fights off a dragon, crab, and rooster.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

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

This small, ingenious cannon once helped regulate Parisian life.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Sip cherry liqueur at a bar dating back to 1840.

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

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

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.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

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.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Where the lovelorn find a home for their sentimental keepsakes.

At almost 1,000 years old, this is the oldest known door in all of Britain.

The world's longest continuously running show has played at this small West End theater since 1974.

Pop culture has helped to keep this iconic British building from being destroyed.