According to the latest Forbes‘s Real-Time Billionaires List, Amazon founder Jeff Bezos is currently worth around $204 billion, making him the second-wealthiest person on the planet, just behind Tesla CEO Elon Musk.

So handing over an estimated $500 million for his 410-foot Koru, the world’s largest sailing yacht, another $75 million for Abeona, its 250-foot support vessel, and then paying the $30 million or so a year to cover running costs for both, should be well within his budget.

Bezos surprised the boating world when he opted for a classically styled, three-masted sailing yacht instead of some flashy mega motoryacht. What’s more it has a buxom wooden sculpture on the forepeak, typical of 19th-century sailing vessels. And since taking delivery last year, he and his fiancé, Lauren Sánchez, have been using the yacht to cruise the world in style.

While secrecy still shrouds Koru, especially its interior and many of its technical features, we take a closer look at what makes it, arguably, the most interesting sailing superyacht in years.