This secluded ruin was once a home for exotic plants.

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

This Singaporean food-court stall was home to the world's cheapest Michelin-starred meal.

Alexander Hamilton’s creation caused quite a bit of controversy.

Shop while you wait for a table in this tiny Indonesian eatery within a mini-mart.

A B.Y.O.B. Mexican cantina lives inside one of the last tortilla factories in Brooklyn.

The highest rapid transit station in the world.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

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

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

An everyday Jackson Heights bodega conceals a Mexican seafood paradise.

Once a month, an Indonesian feast appears inside an Elmhurst church hall.

This historic furnace was once used to produce cannonballs during the Civil War.

Chefs from Tibet's Kham region offer steaming meat pies and noodle soups in this nook behind a jewelry store.

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

This beloved marketplace mascot poops money and grants good luck.

Commemorating the spot where the famous scientist fed his pigeons.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Townhouse facade doubles as an RMS Titanic Memorial.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

A hidey-hole sandwiched between cellphone, DVD, and jewelry stores features Tibetan delights.