Executor, Vader’s Star Destroyer
My take on Vader's flagship from The Empire Strikes Back: the Star Destroyer Executor. Nineteen kilometers from stem to stern, Executor is over 11 times the length of a typical Imperial Star Destroyer (also shown, for scale).
The Lego Group sells an Executor set, but at $400 and four feet in length, it's a bit impractical. Though this 22-inch version has taken me weeks and countless revisions, I'm pretty happy with the result. I'll take better pictures when time permits.