Memorial built in 1922 in remembrance of WWI casualties.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Self-sufficient greenhouse floating on the Hudson River.

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

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

The real-life site of Ichabod Crane's infamous gourd attack.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A waterway covered over after the Industrial Revolution has been unearthed and cleaned up, for the enjoyment of fish and humans alike.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

This building contains handprints that are well over a century old.

The historic home still shows the scars from a little run-in with the British in 1813.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

The secret city built by the Manhattan Project.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."

The only structure left with direct ties to the Salem witchcraft trials of 1692.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

This candy-striped tower is the farthest east you can go in the United States.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

Try a classic Necco candy bar being resurrected in a small suburban shop.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.