An allegorical sculpture in Maryland wears the artist’s politics on its trunk.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A crumbling hospital from the 1850s on Roosevelt Island.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

Beautiful stained glass depictions of the history of human flight fill this surprising chapel.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

A historic grist mill and active sluice on the Black River.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The only presidential monument to display a late POTUS's actual casket.

Abandoned since the 1950s, the streetcar lane beneath the heavily trafficked bridge lays empty and unused.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

The ruins of the suspension bridge hang over Kingsbury Run as a ghost of racial prejudice.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.