Potomac River

In 1903, just weeks before Orville and Wilbur Wright successfully flew their Wright flyer in Kitty Hawk, North Carolina, Smithsonian secretary Samuel Langley launched a daring, government-backed attempt to fly a motorized craft off a houseboat in the Potomac River. Langley's Aerodrome promptly crashed, but — much to the Wright Brothers' dismay — that didn't stop the Smithsonian from crediting Langley with creating the first motorized, manned craft “capable of flight.”