One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

This giant shopping mall still holds signs of its automotive past.

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

The largest permanent Monopoly board makes one of the longest games even bigger.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A unique geological area spiked with wind-carved rocks that resemble teepees.

A walk through the historic city center, under the streets of Seattle.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

This giant temperature attraction created some giant electric bills.

Commonly referred to as the most photographed Victorian home in the United States.

Oakland's beautiful monumental cemetery.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

A classically inspired temple in Redwood City.

A Roman-inspired temple once controlled half of San Francisco's waters.

This quaint archive of the silent era preserves and pays homage to a seminal moment in film history.