During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

This former asylum for Black Americans is haunted by its history of violence and racism.

Decades before the scandal, this staircase on the river was a literal "water gate."

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

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

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

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.

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

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

A local prank turned town icon.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The "lovely red Vega" of the legendary record-settling pilot.

Obscure Freemasons still live in D.C.’s largest private residence.

A celebrity from the late Cretaceous period.