Sleep amongst an abundance of art from the modern era.

Naturally formed rock city in Poland.

Remnants of cone-shaped fascist bomb shelters in Milan.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The fairy tale castle of the "fairy-tale king."

A small but immensely extravagant palace built by the "Night King."

This massive subterranean fissure is known as the "underground Grand Canyon."

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

Steadily reminding Czechia of its past.

This former quarry is now a picturesque gorge that hides a sunken lake.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

Macabre astrological automaton clock dating to the late 1400s.