I did this on Saturday, the iconic Koppenberg climb in Flanders, Belgium. It is relatively easy really in ideal conditions to do it, but the cobbles make it hard going if trying to push for a good time. After a 200km race and other such cobbled climbs, it gets its reputation as a tough finish for the Tour of Flanders; particularly if it is wet.
Locally where I live, we have steeper, much longer climbs but they aren't part of a famous race route.
