Langley Aerodrome No. 5, mounted on top of a houseboat in the Potomac River, minutes before becoming the world’s first heavier-than-air, unmanned, engine-driven aircraft to fly, 1896

Langley Aerodrome No. 5, mounted on top of a houseboat in the Potomac River, minutes before becoming the world’s first heavier-than-air, unmanned, engine-driven aircraft to fly, 1896