The remains of a network of pillboxes and gun emplacements can be found at various coastal locations around the country and a short trip across the English Channel will ensure you come face to face with the Nazi Atlantic Wall that was there to stop the Allied forces returning to mainland Europe, something it failed to achieve.

BBC: The Last Stand

Bergen has written about al-Qaeda, Afghanistan, Pakistan, counterterrorism, homeland security and countries around the Middle East for a range of American newspapers and magazines including the New York Times, Los Angeles Times, Foreign Affairs, The Washington Post, Wall Street Journal, The Atlantic, Rolling Stone, TIME, The Nation, The National Interest, Mother Jones, Newsweek, Washington Times and Vanity Fair.

CNN: About

From the people who brought us Occupy Wall Street comes a new target, the entire G8 nation states and members of the North Atlantic Treaty Organization, aka NATO.

FORBES: 'Occupy Wall Street' Creators Raise The Stakes, Gun For G8 And NATO