Made famous by "Star Wars," these troglodyte homes face an uncertain future.

An underground city of salt.

For over 500 years this timbered alms house has provided a home for elderly residents of Coventry.

A British plaque explains that a house was built using the spoils of the first international golf bet.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Real bones which are said to have belonged to a Polish dragon.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

It was once nicknamed "the most bombed hotel in Europe."

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

The largest whale museum in Europe allows visitors to walk among life-size giants.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A vintage video game wonderland in downtown Reykjavik.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

Something's watching you.

Amsterdam's former hotspot for public executions and dissections.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

Medicinal spa created with the discharge from a geothermal energy plant.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.