I've done LSD and psilocybin mushrooms before.
The LSD experience, for me atleast, gave the distinct notion of being in an enormous simulation, which I wanted to explore to it's fullest. I ended up walking a long way from my apartment, because I wanted to go see my parents, and see if they were in this "simulation". I also seemed to become extremely aware of my bodily senses, just touching my arm became like entertainment because I was so focused upon the stimulation.
I given the whole "simulation theory" some thought before, but came to the conclution that it's simply unknowable, so it's better left for God to explain.
The Psilocybin Mushroom experience on the other hand seems to reveal intense and deep spiritual (don't really like that word) emotions which almost act as a voice to express information. I can honestly say that it felt like being talk to by the creator himself, and a deep relief and happiness that comes over you when you realize that there was never truly anything to be afraid of, and that we as a universe are one.
I also get the feeling, because it is more like a feeling than a memory, that I've experienced things I know I haven't.
tl;dr Psychedelics are rather interesting stuff.