there are many entrances. there is one each at the true poles as dictated by the sun. there is one at the roof of the world in tibet, where the monks pass on antediluvian oral tradition and guard the entrance with fearsome power. there is one in india; this is where the gypsies came from - they were ejected, or removed from that place. the ancient island of avalon was never an island, it is agartha and Arthur Pendragon was taken there and healed with VRIL and lives this day as the king-in-waiting; the nature of avalon was knowledge passed to him by the Fisher King but Morgan le Fay knew it already and guided the wounded. know this - Arthur was the war-king; the old english "pen" was a weapon, not an implement of the j*wish trick that is writing.
there may be one in the states, it is suspected to be in the limestone caves of the center of the country but alaska poses an interesting possibility. there is a reason we purchased it, and that reason gleamed far brighter than the yukon gold. there is absolutely one in south america and I suspect it to be the true hidden source of the amazon river, and the ideal that the conquerers expressed as the "fountain of youth".
the holy grail was not a cup, it was a black meteorite. the dalai lama sent such a meteorite to the King of the World, the Pendragon; it was taken to mongolia (urga to be precise) but it disappeared in 1850. it is very similar to the one in mecca. this tells us that there is an entrance to agartha in mongolia somewhere, and for some reason it was more suitable than the one in tibet to deliver the grail-stone.
your digits are blessed, as were mine.
read guenon and the vedas. dream upon this!