I think its K2 which is in the Himalayas, but I know the Andes has several mountains which are totally vertical. I don't know if they count as mountains, or rock faces/walls.
A banana
Baldwin Street in New Zealand
It has an incline of 38%
According to the Guinness Book of Records, the world's steepest street is Baldwin Street in Dunedin, North East Valley, New Zealand. Baldwin Street is almost 350 meters (1150 feet) long and has a grade of 35%.
Filbert Street in San Francisco in the block between Hyde Street and Leavenworth Street.
bejjing china
Bluebell Street
I think it is regent street in the Dowlais area of the town.
It has an incline of 38%
Herberton Street is a sealed road in Queensland.
Baldwin Street, in Dunedin's Northeast Valley.
dunieden
baldwin street, north-east valley, dunedin, new zealand. rising one metre every 2 meters.