Input (grade 10): For other lists, see List of tallest buildings and structures in the world, List of tallest freestanding structures in the world and List of tallest buildings in the world.
Output (grade 6): This is a list of tallest structures in the world, past and present of any type. Skyscrapers are often referred to as towersSee List of tallest buildings in the world and some towers use the term mast.