Artist's discovery of an 'execution wall' sheds light on the brutal history of Nazi concentration camps on British soil

• An artist found evidence of an 'execution wall' that sheds light on the Nazi occupation of a British island.
• Piers Secunda's exhibition, "Alderney: the Holocaust on British soil," opens in London on March 15.
• It tells the forgotten stories of Nazis prisoners and the atrocities they endured at Hitler's "impregnable fortress."

A British artist probing an almost forgotten chapter of the Nazi occupation of the small island in the English Channel hopes his work will "serve as a warning from history." 

Seeing art as a historical and political tool, Piers Secunda will exhibit new artwork of a reproduction of a "little understood" Nazi execution site later this month in London.