The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Traditional 11th-century outdoor tannery.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

A condom-covered Thai restaurant that is more concerned with birth control than food.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Khmer Rouge's high security prison.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Giant pagoda houses the car that drove Thích Quảng Đức to his death by self-immolation.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

This massive subterranean fissure is known as the "underground Grand Canyon."

This one-time health resort was used by aristocrats around the world.

Go inside to really appreciate this 500-year-old technological masterpiece.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The celebrated eyesore created by starry-eyed sweethearts.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

A subterranean house of worship carved right out of the bedrock.

A decommissioned submarine base makes a great space for graffiti art.