Cologne, Germany - Hahnentor (Hahnen Gate) Postcard Early 20th Century

This postcard features the historic Hahnentor (Hahnen Gate) in Cologne (Cöln a. Rh.), Germany, one of the city’s original medieval gates that once formed part of Cologne's ancient city wall. 
The Hahnentor was constructed in the 13th century and served both as a defensive fortification and a ceremonial gateway for important guests entering the city. 
The reverse side is blank.
Size ±: 14 cm x 9 cm
Please review the images as part of the description.
Authenticity is guaranteed!