Akko (aka Acre)
Located at the northern tip of Haifa Bay, the walled Old City of Akko (aka Acre) is a great mix of mosques, markets, khans (Ottoman inns) and Crusader ruins. As you walk around you can see the remains of the 12th century walls built by the Crusaders who made Akko the main port of their Christian empire.
The underground Crusader city is located beneath the 18th and 19th century buildings standing in the city today. Deep inside is a series of vaulted rooms known as the Crusader Vaults and Halls.
These chambers were discovered when a prison (built above the vaults) had a break in the 1940s and prisoners tunneled into the ground below. The hole through which they escaped can still be seen today high up in the ceiling of one of the vaults.