Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

The final resting place of a poisoned lover whose death was at the center of one of Glasgow's most sensational murder trials.

A small collection of objects of a bygone era hide in plain view.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

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

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

The "lovely red Vega" of the legendary record-settling pilot.

There’s a hidden military meme engraved on the World War II Memorial.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.