The most visited, and possibly most controversial, museum in Germany.

Started as a kitchen garden, now the second largest botanical garden in the world.

The world's largest collection of witchcraft regalia.

The twists and turns of this serpentine maze are over 170 years old.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A fantastic castle rumored to be the birthplace of King Arthur.

The largest greenhouse in the world is home to over one million types of plants.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Famously misunderstood wonder of the ancient world

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.

Sweden's oldest street has not changed for nearly a millennium.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

FDR hoped to find a cure for polio in this Georgia town's warm springs.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

A sulfuric martian landscape that looks far better than it smells.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.