Leonardo Da Vinci was years ahead of his time
Not content with being a great artist Da Vinci turned his hand at architecture, science, music, maths, engineering, and much more. His discoveries and inventions at the time were unfathomable to his contemporaries.
Many of his inventions were never actually realized, but have been preserved for all time in his surviving journals. However, one of these, a hang glider, was actually practically developed in his time.
Some still seem a little "magical" today. His inventions included flying machines, armored vehicles, concentrated solar power, the adding machine, and a double hull. Most were alien concepts at the time but are common practice today.
Although he is not as accomplished as many other engineers on the list, his ingenuity and creativity rank him as one of the most popular technical and artistic minds.