One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

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

The curios of pharmacist and collector Henry Wellcome.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

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

An unusual round church in London with a Templar past.

The anatomical-pathological collection of a man who changed surgery.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

An office built to look like a giant basket.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Odd outsider art installations surround a Gold Rush-era ghost town.

A land of debatable treasure.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Pennsylvania's own Roswell-style UFO mystery.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This shop specializes in oddities and Victorian-inspired wonders.