Kate, Andorra is a principality situated between Spain and France.
Basically it is like Monaco, sort of.
I remember going there the first time and found that they used two currencies, the French franc and the Spanish peseta. These days I would assume they use the Euro, but I wouldn't bet on it.
Andorra is/was, home to many shops selling tax free goods to Europeans.
I know it's high up because the pass through Andorra, is higher than the highest mountain on mainland Australia.