2011 Joplin Tornado
The most popular theory is that the tornado was created by a US military facility. In fact, they believe that the High-Frequency Active Auroral Research Program facility is to blame. The facility studies the upper atmosphere of the earth. Experts say that it's false.
Mystery Hill
Mystery Hill is located in Salem, New Hampshire. It's a 4,000-year-old archeological wonder. No one knows how, why, or by who it was built. There are walls, chambers, drains, and basins all made out of stone inside. Naturally, there are a lot of theories surrounding the formation.