In this photo taken on July 28, 2010, a bomb crater from World War I named "Ultimo Crater" is surrounded by a fence and trees in St. Yves, Belgium. The crater is a result of one of several explosions under the German front line in WWI. A century on, the four seasons bring constant changes to the scarred landscapes and ruins of the World War I battlefields in Belgium and northern France, yet many of the relics still exist, both above and below the surface. (AP Photo/Virginia Mayo)