A lake with turquoise water makes a worthy spot in the National Park Tierra del Fuego. There's a good camping spot right next the lake, so it's easy to stay here for sunrise/sunset shots. Not sure why I didn't get one back in 2011, possibly just too lazy to get up early? ;-)
Thanks to all Phoide contributors to Laguna del Caminante!
Most notably Jiri Hajek.