Singapore's landscaping project is home to 18 incredible Supertrees.

One of the first big sculptures anywhere in Australia.

This historic Australian bridge was built by convicts with giant stone spikes to prevent cattle from falling off the sides.

This giant dish located in a sheep paddock was the primary receiver of Apollo 11 TV transmissions.

This massive water spout has been luring visitors for hundreds of years, some to their death.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

One of the best beaches in the entire world.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Modeled after the big, ferocious Hexham Grey mosquito.