The Mongolian people practice both the Lamaic form of Buddhism but Shamanistic practices are still evident in their lives.
An ovoo is a shamanistic pile of stones that is very sacred in Mongolia. These piles of stones can be found all over the countryside often with hadag (the blue cloths) draped over them. It is good luck to walk around the ovoo three times chanting a sutra. The picture I have here is of the largest Ovoo that I saw. This one is located at the top of the Zaisan Monument in Ulaan Baatar.
As I mentioned before a hadag is a sacred (usually blue) cloth that is hung in temples and on sacred Shaman Ovoo`s. This picture shows the roof of a ger with a hadag hanging there. The hadag is placed here to keep the family safe. A hadag will also be presented at wedding ceremonies to the newly-weds and will then be displayed in their house (usually surrounding pictures of family) for good luck.
Never remove a hadag from a temple or ovoo. If you want one as a souvenir you can buy them at shops near Gandan Monastery.