Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

Exact replica of the ancient monument, but much, much lighter.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This playground sculpture of an icon from the past is dedicated to the children of the future.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

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

Leave a button on the jacket of this iconic Seattle clown.

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

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

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

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

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This forgotten boat elevator was an engineering marvel in its heyday.

Perhaps the most scandalous statue of America's first president.