1. The poem is about Pablo Neruda visiting the ruins of Machu Picchu in Peru and reflecting on the indigenous people who lived and worked there.
2. He calls on the spirits of the dead indigenous people to tell him their stories of suffering under colonial rule, including being whipped and crucified.
3. Neruda wants to speak for their "dead mouths" and understand everything they endured, so he can share their history and struggle with the world.