The home of aviation trailblazers, in a remote corner of the big city.

A way to take your secrets to someone else's grave.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

A curious friendship between two inanimate ladies.

A cargo of beautiful music.

Unlock the secrets of the conjuring arts.

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

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

The place where Dvořák composed some of his most famous works.

The former hotel where Tesla invented the radio.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

The notorious headquarters of a corrupt political machine.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

This Russian bar-restaurant lies within a three-story underground bathhouse.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

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

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

An accidentally hidden library containing the ephemeral history of New York.

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