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

The first archaeological site discovered by aerial photography.

This historic railway museum may have lost its passengers but not its love for trains.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

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

Elaborate tile work in this railway station tells the story of Portugal.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

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

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

An unassuming secret door once led to a legendary watering hole.

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

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

The first artificial white water river course in North America cuts right through an Indiana city.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

New York City's smallest piece of private property.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.