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

This free, take-a-book shop seems like a trick but isn't.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

New York's oldest and possibly grandest keeper of books.

Commemorating the spot where the famous scientist fed his pigeons.

A popular European tradition makes its way to the states on one of America's most famous bridges.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A legendary speakeasy bookstore returns from the brink.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

One of only two commuter aerial tramways in the United States.

More gold than anywhere else, ever.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

New York City's smallest piece of private property.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

New York's oldest magic store.

Try not to get slimed in Tribeca.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

The United States Capitol's former columns still stand.

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

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.