This junkyard made over as a theme park is the "Most Alaskan place in Alaska."

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

An abandoned aircraft sits submerged in a lake in the Alaska wilderness.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

A morbid gateway to an Alaska town prides itself on the hunting history it represents.

The king of U.S. high points towers over every other peak on the continent.

A trading post in the North Pole where children send letters.

'Cause the fence start shaking, the earth was quaking.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Internationally-recognized arts center housed in a century-old former military barracks.

A modest reminder of treacherous waters at the Golden Gate.

Concrete strongholds stand guard over the Golden Gate.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

San Francisco's newly reopened hands-on science museum.

A huge musical instrument played by the ocean.

Visible below the waves are memorials to the city's Gold Rush dead.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A century and a half of research in the sciences and natural history, still going strong.

Over 315,000 preserved amphibians and reptiles in jars.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

The oldest lawn bowling club in the United States.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

San Francisco’s condensed garden of incredible plant growth.