Come Sail Away
There's a certain amount of luxury associated with owning a boat, even if it's a mere speedboat or sailboat for weekend recreation. But the over-the-top vessels often called "superyachts" take boating to another level of extravagance (more than one on this list has a defense system). Among the features of a $500 million yacht reportedly commissioned by Amazon founder Jeff Bezos is — wait for it — another yacht. Here's a look at some of the world's most expensive yachts, inside and out, and their most outrageous amenities.