some Balkh pix, roughly in order by size:
http://www.forumancientcoins.com/gallery/albums/userpics/10002/Walls%20of%20Balkh.jpg
http://i.pbase.com/g6/06/767706/2/78541508.VkBpaVNN.jpg
http://bp0.blogger.com/_-hqDH_BnWE0/R1oISJZ43_I/AAAAAAAABcc/inY7ne0b378/s320/Balkh3.jpg
http://img3.travelblog.org/Photos/45169/191684/t/1423566-Balkh-0.jpg
http://www.afghanmagazine.com/april98/journey/images/balkh.jpg
Actually it was the Sassanids who fell to the Muslim invaders, not the Parthians.
