I have about 15 days to travel the South of Chile?

Which places can I not miss?

Torres Del Paine

There is a lot of beautiful places you cannot miss !
I suggest Torres del Paine .
The National Park Bahia Lapataia between Argentina e Chile.
Ushuaia.
And a cruise in the Chilean Fjords with the beautiful glaciers .

I have been there several times and I keep going back .

Enjoy it .

If you like outdoors sports, go to Pucón. Trekking, rafting, horse riding, excellent hot springs; and do the 4 hours trek on the Villarica Volcano. It's unique, amazing!

i just went on a trip to the south of chile, and it's absolutley gorgeous. i would also suggest Puccon, it's a great place for biking and outdoor sports. and there are hot springs. there is also Temuco. that city has a lot of Mapuche stuff, and a great market. there's also good nightlife there if you are into that. then valdivia is beautiful, but it rains most of the time. they have a famous fish market, and the sea lions come up to the side of the river to beg for people food. there is a great chocolatier there called Entregalos, i went there a couple of times. you can also take a boat tour and go to the island where they make cider. finally, if you can, i would suggest chiloe island. the big island. there are many churches there that are amazing, and you can do sea kayaking, or horseback riding. the culture there is very superstitous, and the crafts there are also beautiful. you could also stop in puerto mont, a very nice city. in the south, the seafood is famous, so if you eat it, make sure to try it! hpe this helps!