One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

Pennsylvanian mass grave and possibly mass murder.

A relic of FDR's brief foray into utopian urban planning.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

These abandoned waterworks are crumbling into the Potomac River.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A priceless collection of the Nation's cryptologic history.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

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

A Saint Nicholas-themed ghost town in the Mojave desert.

An homage to everyone's favorite prehistoric cartoon family.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

One of the indelible moments of the American Revolution took place at this location.

Every drop of D.C. tap water flows through this old waterworks.

A building shaped like the Army Corps of Engineers logo, because why not?

The school tested mustard gas for the U.S. Army during World War I.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

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

The span is crooked and made from two older recycled bridges.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.