Cruise liner, the Carnival Fantasy, features a fairly impressive LEGO model on-board. The model is actually a large scale model of the ship itself!
Being on vacation, I did not have anything other than my smart phone to capture a few photos, so I do not have exact measurements, but this thing is epic! The boat is displayed in a glass enclosure on the public interior shopping level, and features only a LEGO logo on the case. There are no notes regarding who built it, parts count, or even when it was built. Does anyone out there know? Here is a close up of the ships hull that also shows you the water technique employed by the designer. They used a layer of blue, white and transparent plates to create a calm ocean surface with some slight rippling.