In 1502, Leonardo da Vinci proposed a self-supporting bridge design to to Sultan Beyazid II, requirering no fasteners, mortar, or supports underneath—a marvel of engineering relying solely on the forces of physics.

While the sultan dismissed the idea as unworkable, modern demonstrations prove otherwise. This simple yet sturdy design was even portable, making it a valuable tool for military campaigns.

Learn how this ingenious bridge works and why it still inspires engineers today with Sabins Civil Engineering!

[Via Neatorama]