In the Caves of St. Pieter near Maastricht, the Netherlands. A depiction in charcoal on marl of the Virgin Mary, the Star of the sea, and Jesus. According to oral tradition a fisherman who was lost in the city saw her in a vision, during which she guided him to the correct path.
<a href="//commons.wikimedia.org/wiki/User:Anrie" title="User:Anrie">Anrie</a>
CC BY-SA 3.0
Photograph taken by me, <a href="//commons.wikimedia.org/wiki/User:Anrie" title="User:Anrie">Anrie</a>. Author of charcoal image unknown.