The Cave of the Heart of the Deity

The Cave of the Heart of the Deity in the North (Tib. བྱང་ལྷ་རི་སྙིང་པོ་ ,Wyl. byang lha ri snying po) — one of the four sacred caves of Sikkim, and the one to the North of Tashiding.

Located in North Sikkim (tourists need a special permit to go there), it is snowed in most of the year. It seems October or November might be the time to go.