Some things (death, taxes) are unavoidable; others are simply immovable. The heaviest objects in the world have been rated by 24/7 Wall St., which examined the numbers based on sources such as Guinness World Records, the National Institute of Standards and Technology, and various travel, science, and engineering sources. Note that almost all of the world's most massive items were crafted by humans, and that many that approach the top of the list are based on estimates alone. The heaviest item that has been directly weighed, per Guinness: the rotating service structure for one of the launch pads at Kennedy Space Center, coming in at close to 4.9 million pounds. Here are the top 10 heaviest objects and their weights: