Heidentor

The Heidentor (Heathens' Gate) is a ruined Roman triumphal monument erected between 354-361 AD during the reign of Emperor Constantius II, located at the ancient fort-city of Carnuntum in Lower Austria. Originally a tetrapylon with four arches, only one survives today. A central plinth likely held a statue of a deity or emperor. After the Migration Period, medieval locals mistook it for a pagan giant's tomb, giving it its current name. It remains Austria's most prominent Roman landmark.