This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

An unprepossessing stone marks the last resting place of one of the most accomplished Native Americans in history.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

A riverfront park that both remediated and preserved its industrial past.

This man-made waterfall was designed to help improve access for spawning salmon.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

A trompe-l'oeil statue honoring the first guide dog in North America.

A double cantilever system bridge that was designed to prevent flood damage.

A human attendant once directed car traffic from this structure before automated stoplights.

Home of the only civilian casualty at the Battle of Gettysburg.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

The highest point in Virginia can only be reached by passing through ponies and flowers.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

See the nearly two-century-old ruins of pre-railroad America at the former site of a lock on the Ohio and Erie Canal.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

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

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Believe It or Not, Ripley once called this chiseled mountainside “New York’s Mount Rushmore”.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

A Beaux-Arts triumph set to become Ford's innovation campus