Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The oldest operating pharmacy in the world features 800-year-old recipes.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This innocent-looking townhome is actually a subway exit.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

The famous author's cottage hideaway.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

One of the last Jazz Age "Wonder Theaters" in New York City.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The oldest surviving synagogue in New York City is now a soaring art space.

Nondescript elevator doors open to reveal a stunning, surreal world.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

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

New York City's smallest piece of private property.

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

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

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