Old Japanese maps on Google Earth unveil secrets

The maps date back to the country's feudal era, when shoguns ruled and a strict caste system was in place. At the bottom of the hierarchy were a class called the "burakumin," ethnically identical to other Japanese but forced to live in isolation because they did jobs associated with death, such as working with leather, butchering animals and digging graves.

They still face prejudice, based almost entirely on where they live or their ancestors lived. Moving is little help, because employers or parents of potential spouses can hire agencies to check for buraku ancestry through Japan's elaborate family records, which can span back over a hundred years.