The Cueva de Milodon is probably around 40 km or so out to the site and the road isn't paved all the way.
The milodon is an extinct 12 foot tall giant sloth. This was its home. Of course, not all the milodons were 12 feet tall. Some of the younger milodons weren't even 11 feet tall.
There's a scenic interpretive loop trail.
4 km NW of Natales is the old freezer plant "frigorifico" at Puerto Bories, constructed in 1913 and the reason for the existence of Puerto Natales, which served as the lodging and supply point for the frigorifico plant. It was a museum and national monument until 2010. As of December 2010 the site was a construction zone for the new hotel that is going up within the old brick walls of a part of the of plant. The frigorifico is the best preserved and largest of the freezer plants related to the sheep industry that was the basis for much of the economy of southern Patagonia until WWII.