During World War II Michelangelo's David was protected in a brick "beehive"

From Futility Closet:

In January 1943, a brick "hive" was built around Michelangelo'sDavidto protect it from incendiary bombs.

Two and a half years later, preservationist Deane Keller wrote to his wife, "The bright spot yesterday was seeing Michelangelo'sDavidat length divested of its air raid protection.