Abandoned ship reimagined as a street art canvas.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

The painting on an aptly named street honors the 1980s slasher movie.

Eerily lifelike effigies stare at everyone who enters this sanctuary.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

Legends say that this small island was the final resting place of the Welsh saint of lovers.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

At the United Kingdom's only residential library you can sleep among the books.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

Regency-era excess on the English Coast.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Floating swimming pool within a moored vessel.

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

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

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

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 12th-century fortress containing some of Berlin's oldest buildings.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

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

Where once there was a train station bathroom, there is now this German burger joint.

A fascinating insight into daily life in the Eastern Bloc.