Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Try not to get slimed in Tribeca.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

A Manhattan Episcopal church with an eerie underground crypt.

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

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

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

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

New York's oldest and possibly grandest keeper of books.

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

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

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

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

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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A rare view of a preserved Victorian science museum.

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

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

One of the last Jazz Age "Wonder Theaters" in New York City.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.