Earlier today, a postman from Ruskin, Florida, landed a gyrocopter on the east lawn of the United States Capitol building. Doug Hughesclaimed his flight was intended as a nonviolent protest against corruption, and shortly after landing he was apprehended by police. The airspace over Washington DC is specifically restricted by the FAA, and aircraft that violate it risk being shot down in the air and their pilots arrested on the ground. That's true even if someone if flying as weird a vehicle as a gyrocopter.
Autogiros were invented in Spain in the early 1920s by Juan de la Cierva. Initial testing began in 1920, and he first successfully flew in 1923. The rotor spun and wobbled as the plane flew, with the forward-moving blade higher and the backwards-moving blade lower. A spinning rotor provided a couple advantages over a fixed wing: provided the plane was moving, the rotor won't stall. Another advantage is that gyrocopters require much shorter runways than fixed-wing planes, and even shorter ones for landing.
Ultralights also typically operate in the low sky, above 500 feet everywhere and 1000 feet in congested areas. Drones typically operate below 400, though not always. And thanks to their low cost and basic construction, ultralights predate drones as cheap border-hopping vehicles for drug smuggling. While they're limited in carrying capacity and speed, ultralights are tricky enough for radar to spot that in 2012 the Department of Homeland Security gave a $100 million contract to a company developing radar specifically to look for ultralights.
Completing the weird 1920s throwback that is an autogyro landing, one radar that might spot such small aerial interlopers in the future is the radar on these tethered blimps. In response to the flight this afternoon, the FAA released this statement:
The FAA is working with its aviation security partners in the DC area to investigate an incident involving an aircraft that landed on the west lawn of the Capitol this afternoon. The pilot was not in contact with FAA air traffic controllers and the FAA did not authorize him to enter restricted airspace. Airspace security rules that cover the Capitol and the District of Columbia prohibit private aircraft flights without prior coordination and permission. Violators may face civil and criminal penalties.
Watch the gyrocopter land on the Capitol lawn below: