Usually the engine is heaviest.
It is the An-225 with a 1.3 million pound takeoff weight it makes the worlds heaviest airplane.
The C-17. It is worthless
Fully loaded the Knock Nevis Super Tanker is the heaviest ship every built.http://www.worldinterestingfacts.com/infrastructure/top-5-biggest-ships-ever-made-in-the-world.html
the spruce goose
The Airbus A 390 is the heaviest aircraft in productionThe Airbus A 390 is the heaviest aircraft in production
The Wright brothers made the first ever airplane December 17th 1903.
The biggest (and heaviest) spacecraft ever built is the International Space Station, which is still not quite complete (July 2011).
The Antonov An-225 Mriya is currently the heaviest airplane in the world. It has a maximum takeoff weight of around 640 tons and was designed to transport oversized cargo.
Their first fully practical airplane was built in 1905. (Their first powered, sustained and controlled airplane was built in 1903.)
George Cayley built the first glider, Clement Ader built the first self powered airplane, and Wilbur & Orville Wright built the first self powered and controllable airplane.
the largest dam ever built because technically that volume of water was man made