We tend to think of the movies The Pirates Of The Caribbean as CGI extravaganza, but like you often find, practical effects played a massive role. For example, in the major battle scene where the ships are absolutely blasting each other, those were miniatures!
Lorne Peterson and Danny Wagner talk about the miniature effects for Pirates of the Caribbean. Photos ILM, Kerner Optical.
The scene where the entire ship turns upside was a 20 foot long model as well!