Read between the lines of the subway map to find the hidden abandoned Civil War fort.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

100 massive sculptures in the Hudson River Valley.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

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

One of the most scenic falls in Massachusetts has a history of death and grim legend.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

One of the world's tallest statues is also one of its most hated.

This small museum is basically a time capsule of daily life in the Soviet Union.

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

This abandoned factory on the Hudson River once churned out a million bricks a week.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Home of Philip Johnson, one of the 20th century's most influential architects.

137 graves holding New England's earliest residents.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

A seasonal movie monster museum featuring wax creations by a relative of one of the original Universal Studios monsters.

The cave where two British judges hid in exile after sentencing the king to death.