An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

An Orwellian sculpture with eyeball cameras watches passersby.

This artificial cave looks like something out of a fairytale.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

The hidden lair of an alchemist rediscovered in a 2002 flood.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

A tiny metropolis resides inside this student housing complex.

A varied collection of brains in alcohol.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

This secluded walkway overlooks a magnificently wild London green space.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Sail in for a ’dam good slice.

Catacombs turned marketplace.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.