A marvel of Byzantine engineering under the streets of Istanbul.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

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

A floating cat sanctuary on an Amsterdam canal.

This small electronics museum is full of whirring, humming, clicking ephemera.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This cheese shop also houses a museum devoted to Dutch dairy.

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

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

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

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.