Ayahuasca retreats are booming in Spain, one of the only European countries with a legal loophole

As dark falls, Taita Isaías Muñoz Macanilla, a traditional doctor and an Indigenous activist from Putumayo, cleanses a tree-fringed outdoor clearing and the participants seated in a circle in preparation for their first ayahuasca ceremony.

But they are not in the Amazon. Instead, they are in a boutique hotel in Barcelona.