The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

A former major munitions plant that has been converted into a sprawling art space.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

A line of blue paint marks the route of the inaugural parade.

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

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

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

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Bloodstains can still be seen in this medieval church where two medics saved lives on D-Day.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The final resting place to 300 Victorian-era pets hides inside the city park.

This 1920s Dutch barge is now a floating bookstore.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Vast fan-shaped British cemetery honouring American servicemen lost in World War II.

The Tudor-style cottage in the middle of the square is not quite what it seems.

London's old-school healing garden.

Pop culture has helped to keep this iconic British building from being destroyed.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.