You should visit the Chauchilla necropolis when you visit Nazca for the famous Nazca lines in Peru.
Take a taxi from town and stay a little longer than the usual 30mins.
This is the only place where you will get to see mummies exposed in their natural graves. In this very dry flat sandy desert plains lies scattered with exposed skeltons and burial artifacts.
If you stared out into the dry sandy desert, you could make out femurs and fingers phalanges, part of the cranium exposed on the surface. This whole nercropolis is huge and I could only visit a part of it as the rest were protected.
It is just intriguing to see these tombs of the Nazca people, many skeletons still have well preserved long hair and skin out in the open sun after few thousand years.