(CNN) -- Once upon a time, vessels of state, employed to transport princes, ambassadors and other dignitaries abroad, today, superyachts are the playthings of choice for the world's super-rich.
The billion-dollar industry that has sprung up to furnish their needs has pushed design forward in interesting ways over the years.
From the first eco-friendly crafts to the vessels that set the defining style; from the first luxury yacht with sails to the most technologically advanced pleasure boats on the seas, we take a look at some memorable superyacht designs.
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