This hauntingly stark structure is a relic of an industrial past.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Colorful boxes placed over the dead are left to rot and crumble.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

The Flatiron Building's storied West Coast cousin is a lot more into religion.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

Social saloon from a scrapped trans-Pacific 19th century steamer.

A lighthouse built to save lives that took quite a few with its treacherous location.

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

This giant temperature attraction created some giant electric bills.

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

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

Radioactivity still cause for concern at this urban explorer's paradise.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Bits and pieces from the ill-fated Donner Party's winter cabins.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.