Revel in the imagination with these 28 patented inventions that were never realized: comical, revolutionary, extraordinary.
When Leonardo da Vinci invented an elevator, a tank, a helicopter, a pair of shoes for walking on water, he was considered a dream. Today he is understood to be a genius, ahead of his time.
Impossible Inventions includes ideas ancient and modern, revolutionary, comical or simply impossible. Each one testifies to the extraordinary imagination of its inventor.