The Sculpture Park is one of the most interesting places in the city, as it features sculptures by different Chilean artists. It's a nice sanctuary from the busy city and you can have a picnic and relaxing walk here, whilst taking pictures of the art all around.
Wikipedia (Spanish) https://es.wikipedia.org/wiki/Parque_de_las_Esculturas
Address Chile
Coordinates -33°25'12.848" N -70°36'47.268" E