Advent calendars can be found in most German homes during the festive season. Simple homemade ways to count down the days until Christmas originated in the mid-1800s, with parents hanging 24 pictures on the wall or making 24 chalk marks, one of which children could erase each day during the four weeks of Advent. German book publishers, newspapers and printers began producing paper Advent calendars at the turn of the 20th century. Today, many families put great effort into crafting their own special calendars. And in the digital age, online Advent calendars like this one are becoming more popular!