Rests of the Heidentor, also Heathens’ Gate, Pagans’ Gate are the partly reconstructed remains (illustration) of a well preserved nearby Roman City: CLICK right on the image for a layout of the ancient fort city residential area of Carnuntum at the Danube, near Petronell, Lower Austria, Austria. It originally formed a tetrapylon but only one of its four arches still stands todya.
Some 900 meters south of the urban core of Carnuntum, a Roman city boasting a population of around 50,000 and the legionary forces quartered around it. The four-sided one, which was thought to be roofed with four arches and dated with caution to the reign of Constantius II (351-361). The tetrapylons were used as a locale to commemorate victories of a local army. Both sides of the building may have been 14.5 meters across. Without a doubt, there was a plinth in the middle that housed a god or emperor.