Sultan of Brunei's Private Airplane
This aircraft was "remodeled" in Waco. Yes, the sinks are solid gold and one of them is Lalique crystal. The Sultan bought the aircraft for roughly $100M; had it flown to Waco, brand-new, had the interior completely removed; and had the folks at E-Systems (now Raytheon) install $120M worth of improvements inside and outside.
I've gained entrance to nuclear weapons storage areas much easier than gaining entrance to see this airplane. While there it struck me: maybe the rich really are different than the rest of us!