This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

A little-visited waterfall in an otherworldly landscape.

The world's largest military aircraft cemetery.

America's only nuclear missile silo open to the public.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Rocky Atlantic beach home to a stunning stone arch.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.