A remarkable time capsule of American manufacturing deep in Maryland coal country.

This abandoned Victorian-style house was built in 1884.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

Unannounced visitors are now welcome at the site of the largest Prohibition-era bootlegging operation in the region.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

The hulking remains of the Leesburg Lime Company Kiln lie dormant behind a historical marker close to the W&OD trail.

Exact replica of the ancient monument, but much, much lighter.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

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

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

This field of concrete was once an active defense site armed with nuclear warheads.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

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

The ruins of an old mill lie in a small ravine along a hiking trail near Little Seneca Creek.

The well-preserved remnants of a bridge that once made up a WW1-era military railroad.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

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

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.