If you are talking about hard-to-miss landscapes, Caldea would be the most obvious answer: If you're looking for stuff that do absolutely must see/do, then there are a few options depending on your preferences. read more
Keep in mind that customs in Spain and France impose limits on what you can get out of Andorra, so read up on it unless you want to pay extra (thus making the trip to Andorra useless) or even get your stuff confiscated (for goods like alcohol or tobacco). read more