Modelling for big boys
How about Huangyangtan 38 16 00.84N 105 57 00.11E?
Apparently it is a 900Mx700M scale representation of an area on the Chinese border with India. Lots of weird theories out there as to why they've done it.
If you have a look to the west it would appear that there are multiple underground entrances to the hillside although they might just be weird hardstandings 38 15 52.48N 105 55 44.69E