A Treasure Surfaces

Four centuries ago, invaders from Sweden loaded up a barge with several tons of marble sculptures taken from castles and palaces in Warsaw, Poland. They were sailing up the Vistula River when the barge sank, and the treasures were lost, both to the invaders and to the invaded. Now, due to a drought that has substantially lowered the level of the river, these artifacts have surfaced (slideshow): http://news.nationalgeographic.com/news/2012/09/pictures/120926-polish-river-warsaw-marble-treasure-science-drought#/drought-reveals-artifacts-in-poland-river-close-up_59586_600x450.jpg