Here's a landmark terrain set to create "great wall"
Here's an alternative version of this wall terrain (Lighter stone, no hills beneath)
http://forums.civfanatics.com/attachment.php?attachmentid=73533&d=1099946472
Thread
http://forums.civfanatics.com/showthread.php?t=104237
Here's an alternative version of this wall terrain (Lighter stone, no hills beneath)
http://forums.civfanatics.com/attachment.php?attachmentid=73533&d=1099946472
Thread
http://forums.civfanatics.com/showthread.php?t=104237