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

A colorful architectural gem in Seattle's uniquely modern Central Library.

The highest point in Washington state is a volcano covered in glaciers.

Come for the speed, leave in love with the desert.

A modern zoetrope on the New York City subway.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

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

A huge musical instrument played by the ocean.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Antiques by the Bay.

A winding path built in secret on the edge of the continent.

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

Concrete strongholds stand guard over the Golden Gate.

A haunting, yet lovingly hand-hewn potters' field full of graves that flood with each heavy rain.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

Visitors to this library are in for a real-world education in modernist architecture.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

"Purveyors of traditional sweets and vintage treats."

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A once grand hotel is being retaken by the wilderness it once capitalized on.