Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Eighty million natural history specimens call this gargantuan museum home.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.

High winds can make this one scary landing.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

Khmer Rouge's high security prison.

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

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

A battle between nature and architecture in the Cambodian jungle.

Water-powered gadgets whirr to life in this quirky eco park.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A pixel art killer whale is frozen mid-leap in this Vancouver square.

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

One of Auckland's oldest cemeteries was partially demolished during the construction of a major highway in the 1960s. 

This preserved village shows the modest lifestyles of the area's 19th-century Chinese gold miners.

A steampunk airship "floats" above Hamilton Gardens delivering plants and compost.

These two delightful animal-shaped buildings host a visitor center and wool shop.

The "Rocky Horror Picture Show" character has a hidden camera that broadcasts people doing the "Time Warp."

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Hundreds of bras, blowing in the wind.