Aquileia has been declared a World Heritage Site by UNESCO in 1998
Inscription criteria Id. n. 825 1998
Criterion (iii): Aquileia was one of the largest and most wealthy cities of the Early Roman Empire.
Criterion (iv): By virtue of the fact that most of ancient Aquileia survives intact and unexcavated, it is the most complete example of an Early Roman city in the Mediterranean world.
Criterion (vi): The Patriarchal Basilican Complex in Aquileia played a decisive role in the spread of Christianity into central Europe in the early Middle Ages.