This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Trayanovivratatunnel. Tunnel Trayanovi vrata Trayan gates on Trakia highway near Kostenetz Bulgaria The fortress Trayanovi vrata is placed on hill right to the tunnel Own Vassia Atanassova Spiritia Public domain content created by the uploader Gate of Traianus Trakia highway Road tunnels in Bulgaria Kostenets