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

A Victorian-style home known as the “Castle on the Hill.”

Public works and national defense project meant to carve a canal all the way across the state of Florida.

World's largest porcine hairball sits in a collection maintained by Benedictine monks.

This incongruous small ferry across the Willamette River north of Salem, Oregon has been operating continuously since the 1850s.

An institution that preserves the history of institutionalization.

Only known mainland rookery of the threatened Stellar sea lion.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

A thriving Black community was destroyed by an angry white mob at this site in 1923.

A statue honoring 44 continuous years of greeting passing ships.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

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

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

Dubbed the "smallest church in America," this tiny sanctuary was a local grocer's dream come true.