Heidentor
Petronell-Carnuntum, Austria
The Heidentor, also known as Heathens' Gate or Pagans' Gate, is the partially reconstructed ruin of a triumphal arch of the Roman Empire, located in what was the fort-city of Carnuntum, in present-day Austria. Originally tetrapylon in form, only one of its four arches remains.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).