The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

The remains of what was once the world's steepest passenger funicular.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Waterway populated with abandoned projects, including a submarine.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

World's largest herd of white deer populate a former U.S. Army depot.

Long-forgotten artifacts give incredible insight into New York's most glamorous hotel.

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

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

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

Toxic waste disaster that founded the Superfund program.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

The notorious headquarters of a corrupt political machine.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

Records of the dead describe the myriad odd ways people used to die.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

Commemorating the spot where the famous scientist fed his pigeons.

The site of the deadly Triangle Shirtwaist Factory Fire.