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

Red frames showcase remnants of one of New York's original subway stations.

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

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

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

100 massive sculptures in the Hudson River Valley.

A posh members-only club with a literally dramatic history.

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

Rummage through this sunken ship, but leave your scuba gear at home.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

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

An artist's cute bronze subway sculptures belie his violent artistic past.

A bit of retro transportation flair preserved in the world's largest department store.

A hidden "place of interment for gentlemen."

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

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