A lush indoor jungle fills this bustling Madrid transportation hub.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

Cliffside houses provide a spectacular view from their perch above the valley.

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

Commonly acknowledged as the only public monument to the Devil himself.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A curious memento mori hangs in the magnificent Cathedral of Segovia.

A somewhat mysterious biomedical museum housed inside a Spanish university.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

The Tudor-style cottage in the middle of the square is not quite what it seems.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

A cluttered and astounding collection of antiquities and curiosities.

A historic house left in "dramatic still life."

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A surreal statue honoring Prague's favorite literary son.

A mocking tribute to the past and modern leadership of Prague.