Nikola Tesla's former home contains an homage hidden from plain sight.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Wine bottle sculpture with a ship's stateroom inside.

Church in Manhattan holds the bloody sock of Padre Pio, among with many other unusual relics.

Read a book next to a Midtown waterfall.

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

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

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

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

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

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

This semi-hidden Manhattan restaurant is based out of a loading dock.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

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

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

Finally, you don't have to be a pious Swedish seaman to relax like one.