The Stamp and Coin Museum in San Marino holds a fascinating secret: a hidden cistern, an ancient water reservoir carved into the rock.
This cistern was part of a large network of water systems that supplied the growing city of San Marino in the past.
Today, you can see a portion of the cistern through a glass window located in the museum's philatelic gallery.
This hidden treasure provides a glimpse into the history of San Marino and its ingenious water management system.
