A Florida news channel interviewed three urban explorers who have ventured into cast member only areas of Walt Disney World, sharing those adventures with other urban explorers via Youtube:
Obviously, I do not support nor recommend this illegal trespassing. Anyone who does that risks arrest and banishment from Disney property. Disney has legitimate tours and events that will take you into make of these same places (and some places even these guys can’t reach). If you have the urge to go where the average guest can’t, either get a job or take a backstage tour.