Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

An abandoned coal mine reached by a steep hike.

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

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

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

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

This massive swimming pool is the high tech home to the human-powered submarine races.

This statue honors the author's groundbreaking family story.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Brain collection and database that narrows the gap between man and animal.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

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

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.