Tourists visit the obo, which is a heap of sand, stone or earth laid out as a road marker or boundary and is also worshipped as habitation of spirits by Mongolians, at Hulun Buir grassland, north China's Inner Mongolia autonomous region, on July 6, 2012. The beautiful scenery of the vast grassland, forests, rivers and lakes, as well as the unique customs of the Mongolian ethnic group, have attracted a great number of tourists at home and abroad to Hulun Buir grassland every summer.[Photo/Xinhua]