7. lady Moura

Made for Saudi businessman Nasser Al-rashid and constructed in the 1990s, this superyacht hails from the golden age of big luxury yacht design. price: US$210 million Best for: Robinson Crusoes

Boys toys: The unique sandcovered hydraulic platform that slides out of one side of the yacht can be adjusted to sit at the waterline—your very own floating oasis, complete with real sand, deck chairs and palm trees.