A tiny replica of the iconic London landmark hides on the side of the steel structure.

A beautifully eclectic mix of architectural styles.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

The last of Amsterdam's original sea level markers remaining in place.

This hidden garden boasts amazing views of Lyon.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

This ancient theater was once the home of fierce gladiatorial battles.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This garden houses the remains of the ancient Greek port of Marseille.

Diego Rivera hid various people and symbols in his first large-scale mural project.

A Volkswagen Beetle decorated with millions of beads connects Mexico's past and future.

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

An extravagant 18th-century fountain built with bits of broken ceramic.

This extraordinary art museum is like a secret world on the edge of Mexico City.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The only castle in North America to ever house European sovereigns.

66,000 pieces of art, donated by one of the world's richest men.

Part bookstore, part café, and part forest.

Frida Kahlo's childhood home, now a museum of her life and works.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.