Tahua Things to Do
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The Coquesa mummies are partway up Tupiza volcano. It takes an hour by 4WD and shanks pony to get there. The trail is pretty easy, despite the altitude. The mummies are interesting and well preserved.
This is probably included in your Salar tour.
There are good views of the Salar on this walk, and interesting dry stone walls, made from ejected scoria rock