This image shows the main front and a small portion of the plaza in front of St. Mark’s Basilica, the main cathedral in the canal city of Venice.
The description states simply: Venice St. Mark’s Basilica
The basilica is often threatened by rising water and flooding along the Piazzo San Marco which occurs during storm surges from tides, heavy rains and land subsidence in Venice.
This card was used and is dated 3 August 1965.