IMO, astral travelling is just a point of view. I have read a book whose subject was the “another realm”. In this book, somebody said something like that: “In my opinion, this realm resides outside. In yours, it resides inside”. But it doesn’t mean that, since it’s psychological, it’s “just” psychological. On this point, I agree with Carl Gustav Jung when he said that “projections” of the psyche are never to be taken “lightly” and/or treated as a matter of “just” imagination and/or “just” psychological projections. They are “a natural function of psyche that served as a vehicle into the very depths of the soul and into the healing of the soul.”
Thus, OOBE’s, spirit guides can be considered as well as inner (psychological) facts than external facts. Just a matter of point of view. My point of view is rather mixed, as I consider that there are “energies” (which are maybe not measurable with instruments). Perhaps a quantic theory could explain this (Jung was a friend of the quantic scientist Pauli; and the Dalai Lama said there could be relations between buddhist theories of consciousness and quantic theory).
About ghosts. In 40 years, I never have heard about a serious ghost story. And people who say they are in relation with spirits(mediums, spiritists) have always an inner experience of them. The most impressive case I know is Luiz Antonio Gasparetto, a famous bresilian medium painter, who I’ve seen at the TV and is able to do absolutely incredible things, like painting, while in transe, in 5 minutes, a Renoir with the right hand, a Monet with the left hand, a Modigliani with the left foot and a Corot with the right foot, all this in the same time. I’m a (bad)painter, some friends of mine are (good) painters, we’ve seen the documentary film, and we agreed on the fact it was humanly impossible. He made a live TV show on the BBC, too. And in the way it was shown, it was impossible there was a trick (unless reporters were party to him). IMO, it doesn’t mean Gasparetto was in contact with Renoir’s spirit, but with his spirit, that is the energy who inspired Renoir. Just my opinion though.
About divination/remote viewing/precog. I’ve met seers. I already told you they can really see some little things, yet very rarely, and those things are often unuseful. So concerning precog abilities and seeing, the most unuseful it is, the most accurate (it seems… ) My brother and I have had strange remote viewing experiencies. As for me, it happened to me 3 times (to 10 tries) when I passed the remote viewing test at the Boundary Institute. I was able to draw once the exact photograph which I had to guess.
About telepathy. I’ve had two strange telepathic experiences in normal dreams. I dreamt about the content of a phone call I had just after I woke up. Shared dreams are telepathy, IMO.
Thus, I think that there are strange things, not yet explained. But I don’t believe in ghosts, spirits and astral planes, though I think they could be considered as a rudimentary model of a inner/another (?) reality.