There was no one at the Londa burial caves when we pulled up. Up against the cliff, set on rickety scaffolding, were stacks of coffins made of uru wood, shaped like boats, buffalos, and pigs. Radiocarbon dating shows that coffins like these have been used in Toraja since 800 BC. Skulls peeked out of cracks in the wood like nosy neighbors, watching our arrival. As the wood of the coffins decomposes, the bones they contain will go rolling and spilling down the side of the cliff.