If you have never been to Imgur you are in for a treat. It's all user generated and there are many different themes to explore. It took me a while to figure out how to navigate to them, but if you hit the Imgur button on the page it will take to the front page. You will see "Most Viral" at the top. Click just below the "l" in viral and the other topics are there.
Click here for the pics. Some of these images are pretty haunting.