It has been more than 50 years since the first stone of the Berlin Wall was laid in 1961—later to be torn down—but today the world is still inexorably crossed by walls, both visible and invisible. Walls that divide and exacerbate differences, walls that feed ethnic and religious hatred, walls that raise barriers between races and skin colors...walls that create conflicts all over the world. But in this painful yet hopeful story of dialogue amidst conflict, it is important to increase awareness that, perhaps, the walls within us are the most difficult to break down. The documentary Walls, shot mainly around the border between Nogales, Arizona, U.S.A., and Nogales, Sonora, Mexico, shows the border that divides the United States from Mexico. Along the almost 2,000-mile border between the two countries there is a wall, a barrier of more than 600 miles that has been for years a transit point for drug dealers and migrants and the scene of thousands of killings and deaths. In Mexico, the film follows a group of migrants about to illegally climb over the wall. Meanwhile in Arizona, we meet a tough American sheriff who runs a jail for illegal immigrants. In the Arizona desert we also encounter the Minutemen, armed patriots who patrol the border, and the Samaritans, volunteers who distribute water to those migrants who have managed to cross that border. Walls: a dramatic crossroads of human destinies.