Sepia photo postcard of the Porta Gemina in Pola (now Pula, Croatia) — the ancient Roman twin-arched gate of the 1st–3rd century AD, its weathered stone columns and arches still standing in the open air while the k.k. Gymnasium, a grand Habsburg-era school building, rises immediately behind it, two millennia of architecture in a single frame. Pola was the chief naval base of the Austro-Hungarian Empire, a city of layered history where Rome's monuments had simply been built around and built upon; the Porta Gemina survived intact because it had long served as the boundary wall of the gymnasium grounds. Photographer A. Beer of Klagenfurt documented much of the empire's Adriatic territories; this card was published for the Pola market in 1909, five years before the war that would end the empire it served.

• Caption: Pola. Porta Gemina.
• Photographer: A. Beer, Klagenfurt
• Publisher: F.W. Schrinner, Pola
• Status: Unposted