The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Climb inside an iron crystal magnified 165 billion times its normal size.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

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

Cozy basement bar sports an inventory of over 2,000 beers.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

A sulfuric martian landscape that looks far better than it smells.

An underground city of salt.

A Romanian church built from one single oak.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A whimsical bridge adorned with decorative dragons.

One of Ireland's most infamous prisons for rebels including men, women and children.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

This elegant arc of a waterfall marks a religious turning point.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The most famous location in China was home to whole dynasties worth of imperial rulers.

The Guardian of Tallinn.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.