The cache is not a big plastic container with a green cover. There's a pencil inside. :)
Cache is hidden nearby the Sille Şeytan bridge, from which you can see one of the most beautiful view of Sille village. You will see caves, rocky hills... I forgot the name of the bridge when I was hiding the cache, so name of cache on it is "Sille Köprüsü". :)
There is a road from Sille to Tatköy, you will see a roadsign. Follow the way and find a gap between metal road protectors. You will find a path. Then use your gps device.
Some informations about Sille: CLICK!