Take the "Thessaloniki - Athens" national highway towards "Athens". After you drive past "Lamia", you will notice that you are driving on a very long straight section of the national road (be careful not to speed first of all for your safety since that part is quite dangerous lacking a mid-separator between the two opposite directions and second because that section is always patroled by the police). After that long straight section you will find a sign pointing right towards "Amfissa" and "Patra". Make a right. This road is going to lead you to climb mount "Kallidromo" and then the road will continue climbing down the mountain from the other side. You will drive past "Bralos" village and soon you will notice a sign "Kastellia". You are there!
Enjoy your stay!