Dark Fortress

From Spiderman Fanon

The Dark Overlord's fortress is located on Earth, but it's location is unknown. It is only been seen by recruted heros and villains, and of course the Dark Overlord himself. It is pure black, made from the very fabric of shadow, making it near invunerable to attack. it has a giant wall, with a giant gate. It is 100 storeys tall, 100000 metres long and wide. There is a throne room at the top. It has auto defences like laser turrents, drones, and secrurity robots. It also can project shadow walls of illusion that seem unbreakable, these are made from the fortress itself. Little else is known about it.