The plague quarantine island home to the alleged "Vampire of Venice."

A circle stone within a stone circle.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

Perhaps the only prehistoric monument with its very own public bus stop.

Arthur, Merlin, and Guinevere are among the largest and oldest satellite dishes on the planet.

The excellent acoustics of this natural amphitheater made it a popular preaching spot for the founder of the Methodist Church.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

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

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

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.

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

This abandoned five-star hotel is now a five-star urban exploration destination.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Elvis's own personal tropical hideaway.

The bad-ass ride of a soul legend, housed in one of the world's few soul museums.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.