Learn English: A Secret Water Tank in a Museum! (easy)

In a special museum in San Marino, there's a secret hidden away: a big, old water tank!

This water tank, called a cistern, is very old and was built a long time ago to hold water for the people of San Marino.

It's hidden inside the museum, and you can see it through a window while looking at cool stamps.

It's like a little time machine, showing us how people used to live a long time ago!