The encased skull that is widely believed to belong to St. John the Baptist.

Historic medieval fortified city in southwest France.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The celebrated eyesore created by starry-eyed sweethearts.

This modest marker near Notre Dame identifies the very center of Paris.

England's most notorious suicide spot.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

Famously misunderstood wonder of the ancient world

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

This Scottish manor house is a lush relic from the life of a literary great.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

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

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

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

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

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

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This Canary island is a quintessential example of nature’s beauty, and its unbridled fury.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.