An ancient Egyptian temple sits within a modern European museum.

Building Men of War and Indiamen from Holland's Golden Age.

A uniquely preserved neo-Gothic church that is now home to a collection of art and woodcarvings.

It's forbidden to dig within this ancient Roman fort hidden beneath a playground.

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

A former plague hospital turned medical museum.

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

This former guildhall with a bacon-like exterior is now home to a museum covering 600 years of Antwerp's musical history.

This memorial museum chronicles the apocalyptic destruction of the First World War.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

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

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

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

At this 16th-century monastery in rural Bulgaria, visitors can also spend the night.

A massive cave once a secret military base is now home to thousands of bats.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

An homage to the medieval rulers of Bulgaria.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

"Holy Wisdom" overlooks the city that became its namesake.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.