There's a crumbling old mansion inside the Smithsonian National Zoo.

A haunting tribute to pioneering photographer Clover Adams.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This curious sculpture represents the perseverance needed to take to the skies.

One of downtown Berlin's last reminders of its Communist past.

An eerie, derelict amusement park in Berlin.

A distinctive former power plant turned university lecture hall looks like it could make you breakfast.

Final resting place of the humble physicist who discovered X-rays, and made the invisible visible.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The amazing wonder cabinets of a very rich Austrian archbishop.

The stones of this formerly witch-obsessed castle were used to build a church.

A carved grave marker from the 2nd century is mounted in the alcove wall of this Bavarian church.

A delightful but little-known public observatory and planetarium in Munich.

Housed in an old church, this hunting museum holds a collection of mythical bird-rabbit creatures.

The footprint of a frustrated devil in Munich's Cathedral.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

A serious museum dedicated to two German comedians.

A rare chance to ride one of the few continuous elevators still in operation.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This 18th-century folly is one of Europe's rare "garden mosques."

A former Nazi lookout tower with a magnificent view of the Rhineland.