Great for junior high and high school students. Using the current obsession with people taking selfies, students will research a few somber, sacred sites in the United States (you could change it to anywhere) and discuss whether it's a good idea to take a selfie while visiting. I got the idea for this activity after a hearing about a high school girl posting a picture at a concentration camp. I also had this discussion while visiting Hiroshima A-Bomb Dome myself.
Students will learn about important historical sites and won't even know it!