Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

This Russian bar-restaurant lies within a three-story underground bathhouse.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

A prohibition era watering hole for the police.

This former crime corner has been turned into an eclectic community center.

Finally, you don't have to be a pious Swedish seaman to relax like one.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

The former hotel where Tesla invented the radio.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Prove you deserve to be fed by Kenny Shopsin.

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

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

A man-made island fort that has housed soldiers, scientists, and ravers.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.