Nativity with Mary, Joseph and the New-Born Christ, 1933
Stained glass

Cathédrale Notre-Dame d'Amiens, Amiens, France
When I first saw this, I thought it uncommonly modern-looking for a piece of stained glass in a cathedral in Europe. Turns out that's because it was created a mere 77 years ago. Younger than my dad! It's just that when I think of European cathedrals, I don't think "20th century." Indeed, the cathedral itself dates to the 13th century. (Though of course like any cathedral it's always a work in progress to a certain extent.)
Previous Advent post:
2003: Star of Wonder
2004: The Annunciation to the Shepherds
2005: Grateful Greetings
2006: The First Christmas Eve
2007: Navajo pictorial rug, Santa and Christmas tree
2008: The Christians and the Pagans
2009: Why Not a Star