Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

An unusual sand beach in the middle of a forest.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

Mysterious heaps of stones dot these otherworldly woods.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

The Home and murder site of the witch of Rehmeyers Hollow.

The secret skeleton of a murdered nun was discovered in this church basement, but the scandal doesn't end there.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

During the 1990's nearly all of the world's LSD is thought to have come from the operators of the lab once located in this missile silo.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

Visit this playground of waterfalls, caves and sinkholes.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

Curious rock formations in a tiny Kansas state park.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Mountain known by the Tillamook Tribe as "the place of the supreme deity."

Curious cave that stays a cool 56 degrees all year long.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

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

Moonbows over Kentucky.

Legend has it the mill owner's daughter, Mary Musgrove, helped a Patriot soldier hide behind these falls.

An exercise in patience and imagination, where Mother Earth turned common stuff into precious hidden treasures.

Even Henry David Thoreau found this glacial pothole irresistible.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.