This recessed garden protects thousands of mountain plants by creating its own microclimates.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Old Danish castle immortalized in Shakespeare's Hamlet.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The tomb of history's greatest potato promoter is surrounded by tubers.

The final resting place of the "father of special effects."

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

Notorious artist squat renovated into legal studios.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

An architectural oddity hides in plain sight on this iconic London bridge.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

A little slice of Japan and its aesthetics in London's Holland Park.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

A public display of random paleontology.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An icy lake tucked among jaw-dropping alpine panoramas.

Hundreds of hidden passageways weave through the old quarters of Lyon.