A controversial blue hoop has been puzzling freeway drivers since 2013.

Decorated by local artists, the city's utility boxes have become three-dimensional canvases.

The New Central Library is a masterpiece of contemporary architecture in the midst of downtown Calgary.

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

The granite head appears to be deep in thought and half buried in the ground.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

Few other hotels can rival the grandeur of the Castle in the Rockies.

This museum houses two of Mexico's most impressive Aztec monoliths.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

Climb the dead electric pylons of Messina.

The world's most active stratovolcano is almost always erupting.

The ruined doorway is a portal to the building's turbulent and torturous past.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

One of the biggest markets in Asia, under one of the continent's largest domes.

Khmer Rouge's high security prison.

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

A battle between nature and architecture in the Cambodian jungle.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.