If you've ever traveled somewhere new, there's a good chance you've planned your itinerary around popular destinations to make the most of your trip. That’s why famous museums, parks, restaurants and beaches are commonly filled with people trying to experience what makes a particular location so great. But some of us have a penchant for places that are historically associated with death and tragedy. All around the world, these tourists visit concentration camps, historical grounds of famous battles or even places related to mass atrocities.