I loved advent calendars. They were the first signs that Christmas was getting close. Aside from the Christmas decorations going up in the stores right after Halloween.
For some reason, the ones with the glitter made it a little more special. They all have 24 windows/doors and the first few that were given to had a cute picture of a toy or Christmas theme when you opened the door. I didn't get ones that had chocolate behind each door until I was older. I think I prefer the ones with the pictures now, although I've actually order one with Marzipan treats inside from my hometown in Lübeck, Germany. Although, It had a market scene like the calendar above.
Now everyone seems to make one. Lindt, Nestle; Even playmobile and Lego have them now. The marketing machine at full power.
I bought one for my eldest (4 years old) and it helps her learn the days and, best of all, keeps her from asking every day if it's Christmas yet.
One of the nicest things about the calendar scenes is that you could emmerse yourself in the scene and image what a wonderful time everyone is having there.