The world earlier this month celebrated the 20th anniversary of the fall of the Berlin Wall. In doing so what might have been lost is acknowledgement of the walls that currently exist in the world. Canada's CBC-TV tomorrow examines several of these contemporary walls in documentary filmmaker Eileen Thalenberg's world broadcast premiere Up Against the Wall at 8 pm.....Where are these walls? We've all heard of Israel's security fence dividing the official state from the occupied West Bank. Then there is the 'Tortilla Wall' the U.S. is constructing along the Mexican border. More obscure are walls around the Spanish cities of Cueta and Melilla on the coast of Morocco bringing "Fortress Europe" to Africa and effectively preventing entry of Africans to Europe.