Baldwin Street, in Dunedin, New Zealand is the world’s steepest residential street, according to the Guinness World Records. It is located in the residential suburb of North East Valley, 3.5 kilometres (2.2 mi) northeast of Dunedin’s central business district.
The street’s steepness was unintentional. As with many other parts of early Dunedin, and indeed New Zealand, streets were laid out in a grid pattern with no consideration for the terrain, usually by planners in London. The street is named after William Baldwin, an Otago Provincial Councillor and newspaper founder, who subdivided the area.
Source: Baldwin Street