Mechanical doorways, portals built by the Great Old Ones to other whens and wheres, are found throughout our world and Mid-World. Unlike magical doorways, these doors were created from a fusion of technology and magic by North Central Positronics and served mainly as gateways of entertainment. Entertainment, by the Old Ones' standards, was usually in the form of infamous assassinations or other atrocities throughout history. At one time, 595 working mechanical doors existed below Castle Discordia and the Fedic Dogan alone. More than thirty of them were one-way ports leading from New York City to Fedic. Mechanical doorways are dedicated, in that they always open onto the same place.