1994 vs 2009 06/10/2009
 

Thanks to simatani for letting me use this photo of Lanzhou city centre, taken in 1994. I've tried to recreate it below.

Picture
1994
Picture
2009
 
 

There is a route up Baita Shan that takes you along the perimeter of the park itself, and brings you out on the road behind. Look for the steps that lead up to the mosque, to the right of the park entrance. As you climb, Chaoyang Shan is the hillside to the east. Map here.