This 19th century train workshop is a treasure trove of railroad history.

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

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

A working miniature city designed to teach kids about safety and presumably city planning.

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

Millions of numbers carved in glass represent the tattoos forced upon victims.

The world's largest piece of copyrighted artwork.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Ice cream stand, snack bar, and time capsule of milk conveyance.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Granting the right of way to ships over surface traffic since 1917.

This working class sculpture pounds his hammer all the livelong day.

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.

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

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

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.