PBS America

Today's global powers owe their status and significance to natural forces. Geography is the ultimate creator of nations. The USA's ascent as a global power was driven by its unique position between two oceans.

In 1940, Witold Pilecki, a Polish officer, voluntarily chose to be interned at Auschwitz in order to create a resistance network and bear witness to what he had seen.

Harvesting crabs off Maryland's Eastern Shore; a crab feast with two sisters who started a crab business in Baltimore.

In Italy, anthropologists are analysing only the second-ever find of a victim of Roman crucifixion 2,000 years ago.

Grace O'Malley defies gender conventions of her day and becomes the most feared and respected leader of both the land and the sea, eventually rising to Chieftain.

Today's global powers owe their status and significance to natural forces. Geography is the ultimate creator of nations. The USA's ascent as a global power was driven by its unique position between two oceans.

In 1940, Witold Pilecki, a Polish officer, voluntarily chose to be interned at Auschwitz in order to create a resistance network and bear witness to what he had seen.