This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

A bizarre form of natural mummification was discovered in the church of this Frisian village.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

Two gravestones clasp hands over the religious divide.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

This historical Netherlands fortress still bears the marks of its single siege.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

A grassy pyramid named after a French battle.

Incredible labyrinth of man made caves.

This miniature take on the Kremlin is one Dutch man's retirement project.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

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

Amsterdam's former hotspot for public executions and dissections.

This unusual elevator doesn’t stop or slow down.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

This basement museum explores the art and artistry of fascism.

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 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.

Peek through a transparent pyramid and drink in the mountain made of books.