The 439-foot superyacht is one of the world's most expensive yachts for charter. The money goes a long way though. Serene has two helicopter pads, a helicopter hangar, a bandstand, dance floor ...

The “smallest” yacht—Serene—measures a whopping 439.3 feet. A raft of behemoths didn’t make it, including Feadship’s 290-foot Project 821 that is launching this year, the largest build ...