The narrow alleys, domed mosques and colonnaded caravanserais of Akko's old city will transport you to the Ottoman era, but step underground and you're back in the time of the Crusaders, when this port city was the richest in the eastern Mediterranean and Marco Polo stopped here on his way to China. Wander through vast vaulted halls where Christian knights once dined, or follow in the footsteps of the Knights Templar through an amazing tunnel. The picturesque fishing port, lapped by the turquoise Mediterranean, is a great spot for a drink or a meal.