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.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

This 1920s Dutch barge is now a floating bookstore.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

A unique seaside cave where Aleister Crowley faked his own death.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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