This sounds brutal...
http://www.tinmtn.org/mwarbh/page.cfm/About-This-Race
http://en.wikipedia.org/wiki/Mount_Washington_Auto_Road_Bicycle_Hillclimb
In August of each year, up to six hundred riders take part in the race which centers around a 7.6 mile (12.2 km) climb to the top of New Hampshire's Mount Washington—the highest peak in New England. The Mount Washington Auto Road has an average gradient of 12% and reaches gradients of up to 22%. This is more difficult than even the toughest climbs of the Tour de France.
http://www.tinmtn.org/mwarbh/page.cfm/About-This-Race
http://en.wikipedia.org/wiki/Mount_Washington_Auto_Road_Bicycle_Hillclimb