This rusted shipwreck directly in front of a century-old abandoned lighthouse looks almost surreal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

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

Built by the patriotic residents of Boonsboro in a single day.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

An astounding collection of medical specimens, including bits of President Lincoln.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

This former Cold War missile control site played an important role in the creation of GPS.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

The whole world in one water tank.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.