H-4 Hercules 2 “Spruce Goose”
A 200-ton monstrosity, the H-4 Hercules 2 was nicknamed the Spruce Goose because of its wooden frame (despite the fact that it was mostly made of birch). The heavy transport aircraft is the largest fixed-winged seaplane ever built and was designed by filmmaker and business magnate Howard Hughes. Only one was ever built; today it sits in a museum in Oregon.