This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A hidden three-foot-wide house separates these two regal churches.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

Elaborate tile work in this railway station tells the story of Portugal.

The corpse bride of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

At just 51 feet and 10 inches long, it's the shortest street in England.

Old Tudor home moved on thick iron rails to a new spot.

This 11th century tower is said to be the oldest building in Oxford.

The legend says that this English rock formation was once a hunter who was turned to stone by annoyed witches.

Hidden in plain sight, this creepy sculpture watches from above.

Ancient human remains unearthed around the iconic monument.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

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

Part museum, part piece of Arthurian-inspired history, this stately hall attracts King Arthur fans from miles away.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

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