Name: Octopus
Value: $325 million*

While Mick Jagger doesn’t own Octopus, Microsoft co-founder Paul Allen does, he was famously documented for being aboard the ship as he even recorded music there. In order to keep things completely under wraps, Jagger took to the high seas, considering any landlubber studio to be too risky. 

Mick Jagger’s new band is called SuperHeavy, and in 2011 they boarded Allen’s enormous, 400-foot vessel to work on their first album. One can only assume that they did more than work on the voyage, as it would be a shame to pass up on the luxury amenities like the swimming pool and basketball court.