In rural areas, the wall is disappearing at an alarming rate due to erosion and vandalism
Held since May, Pu Zhiqiang faces charges that include 'stirring up trouble' and 'incitement to subvert state power'
Dozens of dissidents were detained or put under virtual house arrest in weeks leading up to anniversary
Fear of violent incidents in Xinjiang and tough anti-terrorism measures have crippled area's tourism industry
Police reportedly break up 23 militant groups, arrest more than 200 following deadly attack on a public market in Urumqi
