I am 55 and I tried my LSD pills when I was 17... I took a Pink one, a yellow one but I will never forget the 600mcg Black Barrel (I say black barrel because it was its color and shape but I never knew the name of that potent stuff). I was 24 hours above the clouds with the first 6 hours very intensively and then slowly going down for the rest of time.
Actually, this stuff put me in front of myself (made me face my real myself and changed my life forever). At this moment, I understood I was a spiritual being and not a piece of flesh. I could see my own body from ouside, could "read" other's minds and see their aura. I could see their emotion with a color around them and feel their thoughts about me (anger. fear, etc...).
Many now won't believe me, but I could see the trick we call "time", how time is an illusion as well as this Universe and that past, present and future are all happening at the same time. I could see the begining of the Universe, it's persistence and it's end and how we, the spiritual entities, were involved in all that process. I discovered, let's say, the real world and how our physical universe was actually only the cast shadow of the real world. And when you can reach the real world even only for a while, you realize that you (and the others) actually rule the physical universe but are not aware of that. We actually create our own conditions, illnesses, sadness, sorrow and happiness.
This was my last trip because from this point, I understood that this was just done to show me the truth and now I had to make my way out of this Universe without chemicals. But I needed this chemical once to point to the truth. It's a bit the same as if you'd live in a foggy world and suddenly see the Sun for 6 hours before it hides again. But now you know it exists and what you're looking for !