The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Waterway populated with abandoned projects, including a submarine.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This was one of the first (and last) university-built and operated nuclear reactors.

The most confusing clock in New York.

The mummified relics of an American missionary.

Little Red Lighthouse under the George Washington Bridge.

Salute the leader of the proletariat.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

A whimsical, but often overlooked clock in Park Avenue.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Volunteer-run library dedicated to exploring five decades of activism history.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

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

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

New York's oldest and possibly grandest keeper of books.

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

Wine bottle sculpture with a ship's stateroom inside.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”