In this Tuesday, April 3, 2012 photo, a tree, protected by a glass enclosure to preserve the Korean writing on them, stands in a forest at a former secret military camp during the fight against the Japanese and the site of what North Koreans say is the home of the late North Korean leader Kim Il Sung and the birthplace of his son and late leader Kim Jong Il at the foot of Mount Paektu. Trees like this were stripped of their bark by anti-Japanese fighters and written messages were left for one another on their trunks. (AP Photo/David Guttenfelder)