One of three sites in England that house the National Collection of Arms and Armour.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A beautiful but toxic fountain of mercury.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

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

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

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.

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

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

A rare double mill nestled along the banks of the Aa river.

Drive past the giant fruit sculptures and up to the window for a menu of fruity treats.