It is likely I will be spending time in Delphi this year - I want to see the site of the Oracle. Athens is my starting point and I was thinking, what else is there in the Delphi area, or within driving distance? I have seen very little of mainland Greece. Also on that trip I want to visit Marathon and Olympia - does it make sense? Delphi is a must-see for this time, but I could let the other two places go if I need to.