The scenery from areas like Magus Stones, Rata sum and all are very, VERY close to the floating mountains in Avatar? Just the load screens for Asuran territory are close as welll, without even venturing outside a town 
edit: http://wiki.guildwars.com/images/thumb/f/fb/Tarnished_Coast_loading_screen.jpg/250px-Tarnished_Coast_loading_screen.jpg
This is roughly what I was talking about.
edit: http://wiki.guildwars.com/images/thumb/f/fb/Tarnished_Coast_loading_screen.jpg/250px-Tarnished_Coast_loading_screen.jpg
This is roughly what I was talking about.