As it turns out, some immovable objects are less `immovable' than others. Just ask the ingenious engineers who manage to relocate some of the least-mobile structures imaginable, including an eight-story smokestack and a 500-ton oil rig. This series follows the process from measurement to planning and all the way through the white-knuckle step of actually moving the structures while avoiding power lines, navigating narrow bridges and dealing with other hazards along the route.