around minute 35 this 1.5 hour video has got a very interesting account of guy going thru a doorway carved in a stone cliff near Lake Titicaca,
and stepping into another dimension, where he meets a being who claims to be from a larger nested universe that created our universe (perhaps akin to an Oversoul collective).
You may find other segments interesting as well.
Lots of insider stuff on UFOs, interface between science and religious cosmologies.