What is the best LEGO set ever? Imperial Flagship, Grand Carousel, Super Star Destroyer, Ghostbusters Firehouse, The Simpsons House, Motorized At-at, King's Castle Siege, Lego Creative Bucket, Eiffel Tower, Tower Bridge, The Disney Castle, Ultimate Collector's Millennium Falcon, The Batcave, Technic Grand Prix Racer, Galaxy Explorer, Back To The Future Delorean Time Machine, Taj Mahal, The Tower Of Orthanc, Death Star, Sydney Opera House.