Miyun
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Miyun is a city in the northeast of Beijing. If you drive to the Great Wall of Gubeikou, Jinshanling, Simatai or Chengde, you will find Miyun.
In Miyun there are Muslim temples, a gate of the Great Wall and a part of the Great Wall. The Grand Princess Palace is located in the north of the city and if you drive to the Miyun Reservoir (the biggest of Beijing), then you will find a European castle.
Also of noting in the north, near another part of the Great Wall, is the Heilong Pool, a valley with some waterfalls.