Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

Constructed in the 1920s, this former pencil factory is now an office building.

A semi-scholarly approach to sex.

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

The competition: breathe deeply as long as you can.

The return of something once considered a basic part of life.

The greatest real estate coup of all time.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

Red frames showcase remnants of one of New York's original subway stations.

This abandoned subway station can still be seen on regular commuter trips.

A hidden "place of interment for gentlemen."

The notorious headquarters of a corrupt political machine.

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

Nope, not Washington Irving's house.

Salute the leader of the proletariat.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

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