What does "case" mean on a museum guide?

"First, head to Room 51 on Level 3 and find Case 4."

This appears on a guide to visit The British Museum. This guide is designed for children and it is full of activities, pictures and there isn’t much information.

I need to translate it into Spanish, but I don’t understand the meaning of this term. Is it suppose to mean the "item" you need to find on that room and level in order to understans all the information given in the guide?

I really appreciate your help! Thank you.