This tiny structure was built by the creator of the Brooklyn Bridge.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A very classy 1920s-era bar right in Grand Central Station.

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

One of Philadelphia's largest murals resides hidden under this bridge.

A piece of the iconic wall found an unlikely new home in a Vegas bathroom.

A 250 million-year-old rock formation has earned a rather unique nickname.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

World War II bunker still standing on the New Jersey beach.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

The world's second largest single-dish radio telescope, once used to contact E.T.

This historic lighthouse was well known for the large number of women who served as its keeper.

Mysterious rocks that ring musically when struck.

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

A unique sculpture park that specializes in the huge and bizarre.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.