Sky-fi may be among the more obscure LEGO building themes, but if you dig deep, plenty of amazing models can be found. The F70 Double Falcon by Vincent Tolouse is a great representation of the alternate-history early aviation-based theme, because it has everything, from beautiful curves to unique and imaginative shapes. Add to that the gorgeous dark red and chrome silver along with some nice part uses such as the Galidor shields at the front, and you get a very memorable and absolutely insane aeroplane.