Mile is a small city (570k inhabitants) within a 2h drive or 35min by train from the province's capital Kunming. It officially became a city in 2013 but has roots from Northern and Southern dynasties (420AD-859AD). It is developing at a fast pace and set in a nice location surrounded by mountains that are famous for grapes that grow at high altitudes and natural hot springs. The altitude ranges from 870m to 2315m at the highest peaks.
Mile is also famous for coal storage in the past.
Train connection from Kunming are available to many cities in China and even Hong Kong:
Closest airport in Kunming