When I visited Osama bin Laden's former base in Tora Bora a little more than a year ago, I climbed steep, scree-covered slopes to reach his Afghan house, perched high above the snow line and commanding views of verdant valleys several thousand feet below. The hamlet, known as Milawa, comprised several lookout posts strung out along ridge lines, a bakery, bin Laden's two-bedroom house and even a crude swimming pool, all of which had been destroyed by U.S. air strikes in December 2001. It is a place where bin Laden seems to have been very happy.