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To learn about the local history. There are natural history items, archaeological artifacts belonging to the khaweshkhar and aonikenk tribes, and historical photographs of Puerto Natales' development.
This is a good place to visit if you are an archaeology lover. The 200-m-deep cave is astonishing, besides there are two more caves which are worth seeing, that have been dug by a team of archaeologist of the Instituto de la Patagonia, having found rests of paleofauna and human remains. The most notable animal was the mylodon, an extinct tall giant sloth which lived some 10,000 years ago at the end of the Ice age. The big cave was its home. Of course, not all the mylodons were 12 feet tall. Some of the younger ones weren't even 11 feet tall. There's a scenic interpretive loop trail and campsites run by CONAF.