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Archaeological Area and the Patriarchal Basilica of Aquileia

Aquileia (in Friuli-Venezia Giulia), one of the largest and wealthiest cities of the Early Roman Empire, was destroyed by Attila in the mid-5th century. Most of it still lies unexcavated beneath the fields, and as such it constitutes the greatest archaeological reserve of its kind. The patriarchal basilica, an outstanding building with an exceptional mosaic pavement, played a key role in the evangelization of a large region of central Europe.

http://whc.unesco.org/en/list/825

The Archaeological Area of Aquileia covers one of the largest and wealthiest cities of the Early Roman Empire, and is considered the most complete example of an Early Roman city. 

The Patriarchal Basilica of Aquileia is one of the most important edifices of Christianity. It is a flat-roofed basilica erected by Patriarch Poppo in 1031 on the site of an earlier church, and rebuilt about 1379 in the Gothic style by Patriarch Marquad. It played a decisive role in the spread of Christianity into central Europe in the early Middle Ages. 

http://www.worldheritagesite.org/sites/aquileia.html