Peru's Entheogen Temples

Stanford University archaelogists and acousticians are studying ancient pre-Incan temples underground in Peru's Chavin de Huantar to understand the use of sound (conch shells) and light in combination with entheogens to induce MSC (Modified States of Consciousness) and mystical experiences.

"The sound is ancient and eerie. For a palpable sense of time, blow into the sawed-off spire of a conch. Feel the ache in your lungs and hear the oceanic roar as it vibrates the hefty shell in your hand.
In the Sanskrit epic the Mahabharata, the warriors blew conches to announce battle. In Buddhism, the conch's deep and penetrating drone proclaims the far reach of the dharma. Tibetan monks still use them to summon devotees.
But in the Andean sierra of South America, what did it mean when, three millennia ago, the pre-Incan residents of Chavín de Huántar raised those ornately decorated conch shells to their lips in the underground corridors of their temple?" 
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