One of the most impressive parts of the Sanctuary area are two huge walls filled with ex-votos.
Ex-votos are basicly the inscriptions to thank the Saint for a particular assistance or intercession. You will find there thousends of those thanks - for healing from seriuos ilness, for a birth of a baby, for retrieved love, for a new house...
It's really touching.
You can see more ex-votos from the Sanctuary of Santa Teresa de Los Andes in my travelogue
The easiest way to get to the sanctuary of Santa Teresa de Los Andes is obviously to have a car. But you can also use public buses - from Santiago you need to go to Auco, Rinconada or Los Andes where you will find a lot of minibuses going directly to the sanctuary.
By car it takes less then one hour driving from Santiago.