If we learn anything from the Cassandra story it should be to listen carefully to people giving what might seem like odd bits and bobs of information, or full-blown theories which initially sound screwy. Satellite photography seems to offer proof, but the final verdict is still out. This kicks the foundations out from under our isolationist attitude. We and every living thing on the planet could truly be alien life forms from outer space. Particularly since the things he foresaw will have great effect on lots of us if they do indeed come about.
Most religions have prophets with varying messages and varying interpretations of the outcomes.
Geography of the other worlds because sometimes people's consciousnesses can travel above the physical dense world and visit those realms where ideas and emotions are made, and perceive them before they precipitate down into physical dense reality. This is where inspiration, new art forms, inventions, and new social policies all come from as well. The space-time continuum because according to physics, the progression of linear time is not the only way the universe works. We've all seen enough sci-fi to know how this stuff goes, and science is now catching up to show us why it works. Physicist Richard Feynman has some fascinating work on sub-atomic particles going forwards and backwards in time.