This 220-year-old house is a reminder of New York City's Dutch past.

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

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

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

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

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

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

The home of one of America's most beloved fictional characters has become a real world landmark.

This mysterious marker puzzles pedestrians and infuriates geographers.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

Snack on a partially gestated duck egg.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

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

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

Nope, not Washington Irving's house.

The notorious headquarters of a corrupt political machine.

This abandoned subway station can still be seen on regular commuter trips.

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

The most confusing clock in New York.

The site of the deadly Triangle Shirtwaist Factory Fire.