Psychonautics
Psychonautics primarily means spiritual growth through psychoactive substances and hallucinogens.
https://en.wikipedia.org/wiki/Psychonautics
Psychedelics
Psychedelics is a field that deals with non-addictive psychoactive substances that aid astral travel.
https://en.wikipedia.org/wiki/Psychedelia
https://en.wikipedia.org/wiki/Psychedelic
https://en.wikipedia.org/wiki/Psychedelic_therapy
https://en.wikipedia.org/wiki/Psychedelic_experience
https://en.wikipedia.org/wiki/Psychedelic_drug
In the Czech Republic, psychedelic substances (LSD, DMT, psilocybin (magic mushrooms), DMT) are on the same level as cannabis, so possession of a small amount of these substances is only a misdemeanor, for which you will only get a fine of about 1000 crowns. In Slovakia, it's jail time.
Definitely don't hesitate to take advantage of this opportunity in the Czech Republic if you have the chance.
And in Austria and Bulgaria, as far as I know, psilocybin is not on the list of prohibited substances.
A quality psychonautic site
https://www.erowid.org/psychoactives/psychoactives.shtml
But I have to admit that so far I have not used any psychoactive substance (except alcohol, anesthesia, and one preoperative sedative in the hospital).