I use this document to give my students a quick overview of the most significant religious site of the Ancient World. It provides the mythic origins of Delphi, interesting facts about it, significant historical events connected to it, and some Greek etymology of pertinent terms.
It comes with a fill-in-the-blanks worksheet and is a great supplement to a mythology unit or a stand alone activity. Students can work individually or in pairs on it in class or as homework. It's very easy to use and also great for filler or down time.