A glacial torrent pours over a 40-foot-high ledge at Gođafoss, “waterfall of the gods,” in Iceland. After the Icelandic assembly adopted Christianity in A.D. 1000, its leader threw his pagan idols into the falls. The mossy island in the foreground, notes geographer Guđrún Gísladóttir, “is protected from sheep.” Photograph by Orsolya and Erlend Haarberg, National Geographic.