These items are all that remain from the room used by the author during his second tour of the U.S.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A decommissioned military complex that's now a modern industrial park.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

Check out the underground party scene at the "Burning Man of Brooklyn."

A living archive of urban activism and space reclaimed.

From scholastic to sepulchral - now under reconstruction.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

The loneliest island in New York.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

New York's oldest magic store.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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.

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

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Known as the "Forgotten City" it was home to industry, riots, artists, squatters, and to one of the largest single disaster fires in New York City.

A charming "tea atelier" hidden away in Greenpoint, Brooklyn.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

Three stories above you, your salad is being grown.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.