A historic ruin just 20 feet away from a busy highway onramp.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

The only labyrinth within the city of Alexandria.

A small and somewhat hidden memorial to 68 local veterans of the Vietnam War.

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

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

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

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

The most decorated dog of World War I is preserved in the Smithsonian.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Dedicated to a U.S. Army lieutenant colonel who was also a bird watcher and artist.

This New York estate was designed to resemble a medieval Scottish castle.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A museum dedicated to the history of electric interurban transit near the home of the first electric trolley system in the United States.

Tile mosaics and quotes from Pablo Picasso add an artistic flair to these bus stop benches.

A 131-year-old wunderkammer of Texas history.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

Two small markers remember the Alamo's feline protectors.

Amazingly detailed marble cinerary urns that once held the cremains of Roman elite.

A tall smoke stack and boarded-up buildings are all that's left of the pioneering plant.