While most of the world’s greatest mysteries involve strange monuments that were erected around the globe, we think that it's even more mysterious when people go missing. When a grown adult suddenly vanishes without a trace, they leave behind so many unanswered questions. Did they consciously choose to go off-grid? Did someone take them by force? And if we learn that they're no longer with us, then where are their remains? It can be an excruciating experience for their family members to go through. Probably the worst part is when the family never gets any closure as to what happened. In this video, we're going to walk you through some cases of famous people who've gone missing. While many of these cases have been cold for decades, we've been able to figure some of them out. Have you ever wondered what happened to Amelia Earhart, Heinrich Mueller, or Anastasia Romanov? Well, we found some answers that might surprise you.