An original apothecary from 1792.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

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

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

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

Outsider art meets paleontology at this roadside reptile repository.

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

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

A historic arena where the Beatles played their first concert in the U.S.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."