2. Tuol Sleng Genocide Museum
This is also considered another haunted and most terrifying place of the world and comes to number two on the list. Welcome to Phnom Penh, Cambodia, home of the Tuol Sleng Genocide Museum. This former high school was converted in 1975 to Security Prison 21 by the Khmer Rouge. The prison was used as a base to torture and murder prisoners. Most of the prisoners were former soldiers and government officials from the Lon Nol regime. However, the Khmer Rouge leaders paranoia soon caught up with them and they began shipping people from their own ranks to the prison. Many prisoners were tortured and tricked into naming their family and associates, who were then also arrested, tortured and murdered. The ghosts of the estimated 17,000 victims of Tuol Sleng continue to roam the halls, and odd happenings around the place are often attributed to them. Most were forced to confess to crimes they did not actually commit.