This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

The first piece of public art dedicated to LGBT rights.

Nope, not Washington Irving's house.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

These ornate manhole covers were used for a now-forgotten purpose.

The former sign of this immortal music venue is just that--undying.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

A reminder to choose water over wine since 1888.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

This humble historic facade hides a history of boozing and the gentlemanly sport of rat-fighting.

This translucent sculpture represents a quintessential component of New York City's skyline.

A small part of lower Manhattan is actually made from a bit of England.

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

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

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

There are owls with glowing eyes in Herald Square.

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

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.