This enormous censer uses a pulley system installed over 400 years ago.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

An ancient Egyptian temple in the middle of Madrid, Spain.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

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

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Built in 1906, this unique building was the first Hindu temple in the United States.

A series of colorful murals breathes new life into old grain silos in Spain.

A house covered entirely with shells.

An abandoned airport in the middle of nowhere.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

What is it about mushrooms that makes people wish they lived inside of them?

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Amsterdam's Red Light District leaves little to the imagination.

This plaque marks the former home of one of the first women physicians in the Netherlands.

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

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

A unique collection of gilded age mechanical pianos.

This subterranean studio is filled with fascinating kinetic art.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.