A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

The world's first interactive human body museum also serves as a chair for a giant orange man.

Amsterdam's former hotspot for public executions and dissections.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

A unique collection of gilded age mechanical pianos.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

A beautiful maze marks where three countries meet.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

A beautifully eclectic mix of architectural styles.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Cat art as far as the eye can see.

Large Hadron Collider and the Birthplace of World Wide Web.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

An eerie, little-known Neapolitan museum filled with preserved human remains.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

The Emperor Tiberius' palace of debauchery.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.