This train station inspired the name of a 1970's rock band and provided the backdrop for their album cover.

A state park that once served as an important river crossing, and now offers protected lands for endangered plants and animals.

This methodist cemetery is slowly receding into the wilderness along a Maryland highway.

This Federal-style plantation house was once visited by Abraham Lincoln to meet with generals during the Civil War.

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

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

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 general store has stood in the same spot for well over a century.

This pun was simply waiting to come to life, and one defense contractor made it so.

The U.S. government built the million-pound stack of steel during the Space Race.

Tiny observatory made big contributions to the study of the Earth's motion.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

These unusual rooms on wheels are holdovers from the 1960s.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The sole surviving building from Newgate village, a colonial settlement that was renamed Centreville in 1792 after it was granted town status by the Virginia Assembly.

The former home of the man whose radical ideas changed the nation.

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

A secret rendezvous spot where John S. Mosby and his Rangers would meet to divvy up their loot after raids.

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

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

A small, forgotten prison cemetery marked only by a wrought-iron fence and eerie depressions left in the ground.

Where pardoned turkeys once spent their all-too-brief final days.