This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This 220-year-old house is a reminder of New York City's Dutch past.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

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

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

During the holidays, a vintage subway train whisks New Yorkers back in time.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

This museum houses an imposing skeleton army comprised of creatures great and small.

This slender three-story building has also had several famous residents.

A small piece of the composer's New York home lives on in the center of Czech culture in Manhattan.

The first museum in the United States dedicated entirely to posters.

You don't have to be an ambassador to dine like one.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A little barn in the middle of the city preserving Hollywood treasures since 1985.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The real faces of Venice beach captured on Romanesque columns.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.