Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A beautiful geyser under environmental threat.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Macabre astrological automaton clock dating to the late 1400s.

A hand-built folk art installation covered with messages of God's love.

The ghostly remains of an accidental sea.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Every equinox this Maya pyramid puts on a spooky ancient light show.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The largest known Ancient Egyptian obelisk.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

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

Come for the flowers, stay for the bats!

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

A battle between nature and architecture in the Cambodian jungle.

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

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

Bizarre dirt trail winds a narrow path above the tree line.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

A white Buddhist temple with a golden restroom.