This nine-story building can be played like an instrument.

A wall of chewing gum moonlights as collective art.

A walk through the historic city center, under the streets of Seattle.

This working class sculpture pounds his hammer all the livelong day.

An ancient necropolis of magnificent tombs.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

A bright little alley in La Boca is a part of tango history.

A colossal statue with a controversial past, forgotten for more than 30 years.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A 11-foot former president stands on a Kosovo street that also bears his name.

A futuristic, brutalist masterpiece that is also strangely prison-like.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.