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

Cryptic messages embedded in the New York City sidewalk.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

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

Peek through the gates at this oasis from the city, full of Old English charm.

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

A crumbling hospital from the 1850s on Roosevelt Island.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A bit of retro transportation flair preserved in the world's largest department store.

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

A Natural History and Science Emporium.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Commemorating the spot where the famous scientist fed his pigeons.

There must be a pun in this haystack somewhere...

A celebration of capitalism in Midtown.

An unassuming secret door once led to a legendary watering hole.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.