Liechtenstein's royal family calls this medieval alpine castle home.

A unique subway station where pillars evoke ancient civilizations.

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

A wooden rollercoaster that still delivers a thrill.

An Egyptian-revival style film house in Boise, Idaho.

The ruins of a military outpost from the 1860s form the centerpiece of a Nevada state park.

The smallest country in the world.

I Street Bridge is the heaviest swinging center bridge in the United States.

This is the spot where the bloodiest battle in the American Civil War may have started.

This historic Union Pacific Railroad depot is a stunning symbol of American post-Civil War progress.

This Frank Lloyd Wright summer house was designed along Lake Erie as a retreat for a client's wife.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

The California capital city once stood 10 feet lower than it does today.

An extraordinary collection of aircraft and spacecraft on display at the original site of the Boeing Company.

The longest and widest floating bridge in the world.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Couple's personal collection of pinball machines turned public pinball museum.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

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

A community gathering place that once housed half-ton tanks and the World's Fair.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

Deep into the lower floors of Pike Place, find a date with fowl fate.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

A wall of chewing gum moonlights as collective art.