Nagasaki: One Square Mile of Japan
Nagasaki sits on the coast of Japan's southerly island of Kyushu.
The city became synonymous with the dawn of the nuclear age; along with Hiroshima, it was one of two Japanese cities devastated by atomic bombs dropped by US aircraft in 1945.
But Nagasaki is also regarded as the country's window to the world. In the 16th century, Portuguese traders arrived, bringing an end to Japan's isolation.
Today, a thriving Chinese community has close links with the Japanese population. Mariko Oi reports from a city of surprising cultural diversity.