Wanna know something crazy? I've had a Giro route prepared for the Race Design Thread for literally about two years that I've never got round to writing up.
It starts in Albania, and stage 1 has a route very similar to the closing circuit of this stage 1. It also includes the bigger climb from stage 1, although that was in stage 3 with an uphill (cat.3) finish in Krujë, because I had a flat stage on day 2. It then had a stage into Matera upon arriving back on the mainland (although this was later excised and replaced), then went up the west towards Napoli, across to Marche, then over to Tuscany. It included San Pellegrino in Alpe, in my case on stage 12, although I had the finish at Stazione Le Polle, a short 5km @ 9% MTF so that it would put the big climb close to the finish. It included Monte Grappa from Semonzo - albeit early in a brutal queen stage that also had Malga Budui, Cima di Campo and Passo Manghen before a finish in the Val di Fiemme. It also visited the Valle d'Aosta at the end, although the similarities in the actual stages here are very few.
There are huge, huge differences in the routes, don't get me wrong, but the number of things in common are somewhat surprising.