At the end of a dark, earthen trail in the Peruvian Amazon stands a round structure with a thatched roof that appears to glow from within. In the Temple of the Way of Light, as it is known, indigenous healers called Onanya teach visitors about the therapeutic uses of ayahuasca, a hallucinogenic brew that locals have used for thousands of years.

Source : This psychedelic drug seems to affect the brain in ways that are surprisingly similar to meditation