Wutai Shan in China might also be a good place; Vimalamitra is still there.
Yes it definitely is & I remembered it a couple of hours after posting. Wutai Shan or the Five Peaks mountain is mentioned in some prophecies as becoming important in future. The late Jigmed Phuntsok buried terma there recently, probably some of the many famous miraculous terma he received in Tibet. There are 4 sacred mountains in China proper but 5 Peaks is the most important. I also forgot to say the Bon have 37 major sacred sites & the famous Bon Olmo Lung Ring in the land of Tazigs is the most important & is in fact Shambhala. Shambhala is a bit different to others as it is a power place as well as a society of certain type of sentient beings. In the Himalayas Chatral Rinpoche opened up a couple of remote power place caves accompanied by a group of people years ago. Another important Himalayan region which has quite a few unopened Beyuls apart from Bhutan is the famous remote PemaKo region. There are a lot of power places everywhere in the world which become centers of great good or evil if abused. However the most important power places are the ones in India, Himalayas & Tibet.