Pozza San Glisente rises south out of the village of Esine, Italy, has sketch tarmac, a tough average gradient of 18.1 per cent, and an even tougher maximum gradient of 35 per cent.
According to La Flamme Rouge tweet this is the hardest climb in the world.
Located in Lombardy, Pozza San Glisente it’s 9.6 kilometres in length and has an average gradient of 18.1 per cent.
If that weren’t enough, most of its road surface is cobbled. Even just thinking about that makes your legs hurt. However, you can take a look at these videos of the descent on a mountain bike.