Last summer I went to Crete for a short vacation, and came back with fond memories of the local cuisine.
Before leaving I bought some spices, among them a small bag of diktamo (dittany, or dictamnus).
While the smell is quite nice, I found that it doesn't impart any discernible flavour to dishes.
I tried it in some recipes that call for oregano (homemade pizza, some pasta sauces), but I'm curious as to its use in Greek cuisine; maybe I'm just using it the wrong way.