EuroVelo bicycle routes are a network of (currently 14) long-distance cycling routes criss-crossing Europe in various stages of completion. As of May 2013 more than 45,000 km (27,962 mi) was in place. It is envisaged that the network will be substantially complete by 2020 and when finished, the EuroVelo network's total length will exceed 70,000 km (43,496 mi). EuroVelo is a project of the European Cyclists' Federation (ECF).
Ride the Tour de France High Passes. 'Tourmalet remains one of the classic Tour ascents, drawing hordes of cycling pilgrims, as does Col du Galibier, the first Alpine climb introduced into the race (in 1911). Prime among the other famed climbs are the Alpe d’Huez (first raced in 1952) and Mont Ventoux (1951), rising mighty above the Rhône valley. All four passes have been ranked hors categorie, meaning they’re so steep as to be beyond classification.' http://www.lonelyplanet.com/france
Alpe d'Huez - Tour De France - The climb is 13.8 km at an average 7.9 percent, with 21 hairpins named after the winners of stages there. Alpe d'Huez is the "Dutch Mountain", a Dutchman having won eight of the first 14 finishes.