One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

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

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This lucky bronze frog was gifted to Madrid by a casino.

This open-air sculpture museum is located under a bridge in the center of Madrid.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

Villas that once served as playgrounds for the rich now fall away in decay.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

The attic of a four-century-old canal house hides a clandestine church.

Widely advertised as Amsterdam’s narrowest street, this passage was once a highlight of the Red Light District before its windows closed.

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

A public urinal so pretty, it was declared a national monument.

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

In 1988, jazz legend Chet Baker fell to his death from a window of this hotel facing Amsterdam Centraal.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

The world's largest private telescope collection hides in a secret wing of a Dutch auto museum.

In the Netherlands, one of the world's largest private car collections can be found.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Lumps of significant stone from around the world surround a flaming monument for peace.

A preserved building where the dead were once watched for signs of life.

The largest 19th century panorama in the world still in-situ.

An homage to everyone's favorite prehistoric cartoon family.