A Gothic cathedral created from volcanic rocks.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

Beautiful public park off the beaten path and away from tourists.

The U.S.' first commercial park dedicated entirely to flying drones.

The humble beginnings of the man known for his lavish "champagne" music.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

It's good luck to be mocked by this monkey.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This ancient fortress in Iran was once the oldest and largest treasury in the world.

Long before air conditioning, Persian architects found an ingenious way to cool off.

This circular Iranian jail was once a political prison run by the country's secret police.

Marked by the hand of the explorer Henry Morton Stanley.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

A dreamy mausoleum honors Persia's most famous poet.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

17th century mosque for Shah Abbas' harem.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

Ancient structures used to make and preserve ice in the deserts of Persia.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.