I think the Marie Celeste is the strangest. Because there are almost no clues for this mystery. There were no signs of violence and the foods were on the table. That means crews and the captain were suddenly disapeared for something  was very important or dangerous. Also, when the captain of the Dei Gratia found the food, it was only few days long but the diaryof the ship was 10days long!  Because this mystery has no idea to tell, so I think the Marie celeste mystery is most strangest mystery of all.