Okay kiddo, have you ever heard of a hypogeum? It's kind of like a secret underground room or passage!
Imagine you are playing hide-and-seek with your friends, and you decide to hide in a secret room that is underground. That's kind of what a hypogeum is like!
People have been building hypogeums for thousands of years. They were used for all sorts of things, like for storing food, keeping valuables safe, or even as tombs to bury people who have passed away.
Hypogeums were usually built by digging a hole in the ground and then building rooms or passages beneath it. Sometimes, the rooms would be very large, and other times they would be small and cramped.
One of the most interesting things about hypogeums is that they are often very cool and humid inside. This makes them a great place to store things that need to be kept at a cool temperature, like food or wine.
There are lots of hypogeums all around the world, and many of them are still around today. Some of them are even tourist attractions!