Unrepaired walls from a 1920 anarchist bomb attack.

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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

A wooden replica of France's famous tower.

“Invented in Key West, Perfected in Brooklyn."

Four cars from the old system were once on display, but were removed in 2014.

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

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

One of only two commuter aerial tramways in the United States.

Wine bottle sculpture with a ship's stateroom inside.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

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

Commemorating the spot where the famous scientist fed his pigeons.

Try not to get slimed in Tribeca.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

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

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

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

The most confusing clock in New York.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

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

A graffiti Mecca welcoming artists from around the world.