Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The rogue roots are gradually consuming some of the historic marble grave markers.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

At 207 feet, one of the world's longest continuous escalators.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The bones of two medieval royal lions were discovered at the historic fortress.

England's most famous front door has an accidental doppelganger.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The ritual has been performed uninterrupted for nearly 700 years.

An architectural oddity hides in plain sight on this iconic London bridge.

Where condemned pirates met their grisly end at the gallows on the River Thames.

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

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

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

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.