This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

At almost 1,000 years old, this is the oldest known door in all of Britain.

A faded reminder of what was once a common sight in London during the Blitz.

A lasting remnant of The Blitz.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

A kaleidoscopic warehouse-maze of handmade neon signs.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Visit the WWII bunker where the British won the battle for the skies.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

A formerly abandoned mental institute, now back in business.

An unrealized dream to wirelessly electrify the entire Earth.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

The poet Walt Whitman was a frequent visitor to this spot, the highest on Long Island.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

This museum-within-a-museum pays tribute to "The World's Most Experienced Airline."

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The oldest living organism in New York City. Maybe.

The largest stone moai on Rapa Nui.

In the Middle Ages, villagers would sound this stone trumpet to boost fertility and coax fish to shore.

This large round boulder is said to emit spiritual power, but it may just be magnets.