A memorial marks the library lobby where Langston Hughes' ashes are buried.

A prized globe signed by Amelia Earhart and Charles Lindbergh sits in the Brooklyn office of the American Geographical Society.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Walking around West Harlem reveals a scavenger hunt of beautiful bird murals.

There are owls with glowing eyes in Herald Square.

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

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

One kilometer of thick brass rod laid out before your eyes.

Play heads or tails with thousands of different coins.

A Gothic-style abode built to accommodate the church's three resident peacocks.

Hiroshima survivor on Riverside Drive.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

Harlem park dedicated to compulsive hoarders killed by their own junk.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

The highest point on the island known for buildings that touch the sky.

This was one of the first (and last) university-built and operated nuclear reactors.

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

The first piece of public art dedicated to LGBT rights.

Phil Mortillaro uses keys to bring art back to the Village.

The most confusing clock in New York.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.