I am going by memory here but as I recall there are 4 main power places in India (cardinal directions) & 4 in Tibet which include Samye & Potala mountain. Padmasambhava then yesheTsogyal blessed Tibet as a main power axis for the planet next to India as Cherezig wished in his chosen homeplace. There are also 108 main power places in Tibet (this includes Himalayan Beyuls) & similar number in India a few of which are shared & currently the majority mainly revered by Hindus only. Some outside in Himalayan Beyuls (Bhutan, Sikkim, etc.) have not been opened up. Most of the Tibetan ones were opened up. Also outside Indo-Tibet: Oddiyana (Swat valley in Pakistan-where most high tantras were revealed to Indian mahasiddhas) & Shambhala (Afghanistan) are important as is Sri Lanka. ChNN has been saying for many years he had dreams in which he was told Kyrgyzstan was the birthplace of Anu yoga. Until recently there was no evidence of Buddhist institutions there but in the last few years suddenly lots of Buddhist monasteries and even large statues have been uncovered there. There will be not only power places (already in all continents) but in future other large power axis areas will blessed in the long future too in the 1000 Buddhas' periods to come yet.
By far the most important power place is Bodhgaya. That is where the 1004 Buddhas are enlightened. On enlightenment they will see if & when Dzogchen will be transmitted in their cycle by themselves or others as well as Vajrayana which will occur for more of their cycles. They will also see what is the teaching they have to start the whole thing with. Shakyamuni's Buddhism started with the 4 noble truths, other 1000 ones' will be different to suit their period. Bodhgaya is not only the most important spot to this planet but some other world systems will benefit from it's fruits as they already do. It is utterly inconceivable. Chokyi Lodro Khyentse & consort there:http://www.keithdowman.net/books/ppct.htm