City Council meetings still happen in this historic building, impeccably preserved on the inside.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

The stunning interior of this Gothic church is covered in ornate gold details.

This historic streetcar system has been running since the 19th-century.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

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

The first piece of public art dedicated to LGBT rights.

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

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

A Manhattan Episcopal church with an eerie underground crypt.

One of only two remaining Victorian-era greenhouses in New York.

A mass grave for victims of one of the city’s worst fires.

A way to take your secrets to someone else's grave.

A curious friendship between two inanimate ladies.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.