Yes. In my memoir "A Long Initiation - unexpected magic". And I may have mentioned some stories on Medium, but not all in one place. The end of "The Slide" takes place in Shambhalla and are memories taken from experiences I've had there.

The third book in "The Arc of the Immortals" titled "Ennead" takes place in Shambhalla, Lemuria and Atlantis and has some of my memories of those places as background.