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

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

There must be a pun in this haystack somewhere...

Commemorating the spot where the famous scientist fed his pigeons.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

There are owls with glowing eyes in Herald Square.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The first and only carousel with a lineup entirely of insects.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

An activist who committed her life to peace and women's suffrage.

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

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

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Unique antiquarian shop specializing in globes, maps, and prints.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

Recovered suit of a cannibalistic West African gang.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

The oldest living tree in Manhattan comes shrouded in sinister legend.