I refresh the thread after a few years of break
Giro has so many epic climbs that it can be hard to decide but I have my favourites:
1. Stelvio
King of climbs in Europe. Icon for cyclists and motorcyclists. It has all: sky-high altitude, enormous elevation gain, unrelenting steepness, phenomenal road, stunning scenery and historically legendary status. When someone says 'classic mountain road' then many think 'Stelvio'. Giro organizers 'discovered' a few monster climbs (like Zoncolan and Finestre) in order to surpass Tour mountain stages. But Stelvio from Prato with its 48 hairpins easily eclipses all of TdF climbs. Organisers should use it from this side more often. Maybe some MTF or ITT with 1850 meters of climbing?
Unfortunately my only Stelvio (from Prato) memory is from 2005 when my favourite rider Ivan Basso lost there almost half an hour...
2. Finestre
During the Tour de France commentators often describe 9-10% gradients as 'very hard sections'. How about 18.5 kilometers of such a 'section'? And nearly half of it is unpaved. This climb is a freak. It instantly became a classic in 2005 when Simoni, Di Luca and Rujano tried to crush Savoldelli. Some TV images of unpaved section were shown without colors and it resembled legendary Coppi - Bartali battles. It has potential to become the biggest cycling icon - especially if some day TdF decides to use it...
3. Gavia
Giro legend - beast and beauty. It's place in top3 is for similar reasons as Stelvio. Tough ascent, high mountains, narrow road, snow tunnels and historical moments. When I saw on TV Gavia stage for the first time the weather was good and I was stunned by its beauty.
There are obviously many other super-climbs. Very hard and beautiful climbs of Fedaia or Tre Cime di Lavaredo. But I'm actually not a big fan of that leg-breaking gradients of Zoncolan. Somehow I don't "feel" this mountain (at least so far) despite it's already becoming a legend.
And Stelvio...in July: