Walk into the 19th century without leaving Brooklyn.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

The first museum in the United States dedicated entirely to posters.

A whimsical, but often overlooked clock in Park Avenue.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

This small, hidden cove is home to abandoned boats.

A hidden "place of interment for gentlemen."

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

The former hotel where Tesla invented the radio.

A Jewish deli run by Yemeni Muslims in an Afro-Caribbean neighborhood is quintessential Brooklyn.

The library of every book lover's dreams.

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

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

New York City's only preserved family home from the 19th century.

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

Unrepaired walls from a 1920 anarchist bomb attack.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

The site of a tragic massacre that spawned a multimedia franchise.

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

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

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