Sailboat or Liner?

A lazy day on the beach again today. It was a lovely day so we got planty of chance to swim and read and the like. It was a bit sad since it was our last full day before heading home but we made the most of the sun.

As the sun started going down we spotted the most bizzarre boat on the horizon. It was the size of a cruise liner but had four yacht style masts on the top. I'll have to do some research and see if I can find anything out about it.