The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

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

Oldest existing wire suspension bridge in the United States.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

A monument to the military service of America's greatest traitor refuses to even name him.

This abandoned ironworks was once the most important military supplier in America.

Reforestation in action is the main attraction in this abandoned quarry.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This mouldering abandoned mental hospital was once a center for progressive healing.

"A hideous albatross in the Hudson River Valley."

The Hudson River School comes alive at this palatial estate.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The oldest continuously inhabited street in America.

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

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

An abandoned dollhouse factory.

A once grand hotel is being retaken by the wilderness it once capitalized on.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.