"DaVinci Cannon" found in Croatia

Known for his artwork and whimsical flying machines, Leonardo DiVinci's military designs were in high demand in his lifetime. Now, archaeologists believe a 15th century triple-barreled cannon may be the first physical evidence of DaVinci's concept design for an early machine gun.

The bronze cannon resembles sketches found in DaVinci's Codex Atlanticus.  This particular cannon may not have been a success, as it was found with the back end blown out. The cannon was found at the site of a border fortress that would have been in conflict with the Ottoman Turks at the time.