im planning to stop in Spain for 4 days on my way home from Israel. i found decent tickets to BCN. i was initially planning on only going to Barcelona and Madrid but a friend of mine told me that Gibraltar is a must do. it seems like Gibraltar is around 6 hours from Madrid. whats the best way to go about this? should i stick with BCN MAD or is it really worth the schlep down to Gibraltar? will it help to fly into Madrid?