In reply to stevieb:
I'd have Espolon Central in there. Espolon Limaban at Sierra de Toix is a charismatic two pitch 5+.
Agree with Duncan Bourne that Sjeverno Rebro in Paklenica is good at 4b+ and Nosorog 4c+ gives 7 pitches of which 4 are very good.
On Kalymnos, Wings for Life, 5, on Telendos, The White Rose 6a at Irox, Pornokini 6a at Arginonta are single pitch routes I enjoyed and remember. I enjoyed Capa san Vito routes in Sicily and Crni Kal in Slovenia, but at the moment nothing classic comes to mind.
In En Vau in the Calanques, La Saphir's 5 pitches of 5 was good, and I was glad of a steady leader on the crux.
Le Grand Parcours on Mte Ste Victoire, 17 pitches of 5+ is still on my bucket list.
South Ridge of the Hexenstein at the Falzarego Pass in the Dolomites is varied and 'classic' with 7? pitches of IV+, and the South Face of the Cima Grande at a similar grade, but I suppose that they might not qualify as sport for some of your respondents.
Its hard to think of a list of mainly single pitch classic European routes, because there's simply so much rock to choose from, unlike in the original Classic Rock where we have UK crags to draw on.
I have however, turned many nondescript routes into struggles of Classic proportions more or less everywhere I go, so my list is going to be longer than most.
Dave