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

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

Spike Lee's provocative film is officially honored right where it was made, the first time a work of art was used as a secondary street name.

This innocent-looking townhome is actually a subway exit.

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

A posh members-only club with a literally dramatic history.

Tucked in the back of this amazing antique store is an important piece of medical history.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

The "Seinfeld" diner.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

A celebration of capitalism in Midtown.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.