A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

The world's largest wooden structure.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Super-heavy Nazi architectural experiment.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A brush maker used his factory to protect blind Jews from the Gestapo.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Budapest's Communist-era statues, banished to the suburbs.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The "Prussian Versailles" that is as glorious today as when it was built.

These fantastically named natural pools look like something out of a Scottish myth.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Largest lake in Great Britain measured by surface area.