From the World Heritage inscription for the Old City of Acre:
Acre is a historic walled port-city with continuous settlement from the Phoenician period. The present city is characteristic of a fortified town dating from the Ottoman 18th and 19th centuries, with typical urban components such as the citadel, mosques, khans and baths. The remains of the Crusader town, dating from 1104 to 1291, lie almost intact, both above and below today’s street level, providing an exceptional picture of the layout and structures of the capital of the medieval Crusader kingdom of Jerusalem.
The World Heritage Committee inscribed The Old City of Acre on the World Heritage List under criteria (ii), (iii), and (v):
Criterion (ii): Acre is an exceptional historic town in that it preserves the substantial remains of its medieval Crusader buildings beneath the existing Moslem fortified town dating from the 18th and 19th centuries.
Criterion (iii): The remains of the Crusader town of Acre, both above and below the present-day street level, provide an exceptional picture of the layout and structures of the capital of the medieval Crusader Kingdom of Jerusalem.
Criterion (v): Present-day Acre is an important example of an Ottoman walled town, with typical urban components such as the citadel, mosques, khans, and baths well preserved, partly built on top of the underlying Crusader structures.
A former Crusader castle and Ottoman fort, the old city of Acre is still inhabited today. Mostly home to Israeli Arabs, I witnessed kids going to school and an Arab wedding within the walls of the old city. Much of the original Crusader structures are underground, where a network of tunnels was built.
View the complete list of UNESCO World Heritage Sites in Israel.
View the list of all of the UNESCO World Heritage sites I have visited on my travels.