Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

These spooky and unusual stone formations create an underworldly landscape.

Study the Alien etchings in this fountain while you refill your water bottle.

Middle-earth in the middle of Switzerland.

In memory of The Blur Building, the temporary exhibition pavilion of vaporous nothingness.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

The most impressive of Basel's three remaining city gates.

Its vast collection of wondrous gadgets details the fascinating history of information technology.

A 30-foot-high stream of chocolate flows continuously at the Lindt Home of Chocolate.

This massive boulder was hurled into a Zurich church when a gunpowder depot was struck by lightning in 1652.

Underneath the well-known Lindenhof hides a secret cellar documenting Zurich's early history.

Grind your own flour to bake your own bread at a 100-year-old mill.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

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

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

The heads of two giant mythological water horses honor Scotland's horselord past.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

A scattered trail of street art adds a pop of color to the city's stark structures.

This stately estate house features a tower covered in a bright, modern mural.

Largest lake in Great Britain measured by surface area.