This image features the details and construction of the arched walkway common to many missions throughout the chain. As can be seen through the eroded plaster the pillars and arches are made of fired brick while the ceiling is wooden beams.
The description simply states: C27 Mission San Juan Capistrano
–The official website for Mission San Juan Capistrano shows some of the evolution of the mission site and the current ruined state of the main chapel. This card likely dates from the 1950s.