An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

Art deco landmark on the outskirts of Washington, D.C.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

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

Moonbows over Kentucky.

This grand gothic brewery has been pumping out suds for over a hundred years.

People escaping slavery may have hidden inside a corpse vault.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This forgotten boat elevator was an engineering marvel in its heyday.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

These abandoned waterworks are crumbling into the Potomac River.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

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

The ruins of this long-abandoned unsuccessful gold mine can still be found.

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

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

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

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.