Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

NYC's legendary underground network for bovine transportation.

Join in a Seance at the Swedenborgian Church.

Haven for steampunks.

The site of the deadly Triangle Shirtwaist Factory Fire.

A notorious punk house turned co-op.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Salute the leader of the proletariat.

The notorious headquarters of a corrupt political machine.

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

The greatest real estate coup of all time.

There are owls with glowing eyes in Herald Square.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

The former hotel where Tesla invented the radio.

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

A legendary speakeasy bookstore returns from the brink.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

Little Red Lighthouse under the George Washington Bridge.

Hiroshima survivor on Riverside Drive.

A dilapidated dock tells the story of Titanic's missed arrival.

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Storage warehouse of the rich and famous.