This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

This kitschy tavern is also home to rare early editions of "Treasure Island."

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

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

These unusual rooms on wheels are holdovers from the 1960s.

What looks like a normal building is really a hollow facade hiding a subway vent.

A hidden three-foot-wide house separates these two regal churches.

This sprawling bookstore spans four floors and has more than a million books in stock.

Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.

At this hidden studio, the dying art of taxidermy is alive and well.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Long tunnels run under the ancient chariot racing circuit to the tower.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

The colonial city's social history is reflected in its fanciful door knockers.

This landmark building is now a vibrant performing arts space with musical acts from around the world.

In the absence of a Chinese-language newspaper, for years the community posted daily updates on this simple bulletin board.

This unique Seattle structure was designed to be the greenest commercial building on the planet.

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

This historic hub for labor unions has survived the city's changing landscape.

The four tall pillars once marked the entrance of the historic Seattle church that fought for women's suffrage and civil rights.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

The embalmed remains of the communist leader lie within a custom crystal coffin.