The current most expensive car in the world is the Rolls-Royce Arcadia Droptail, which costs around $31 million . This bespoke luxury vehicle is designed for some billionaires in Singapore, with various exclusive details that boggle the mind. The Arcadia Droptail uses a rear decklid of Santos Straight Grain wood, for which 223 pieces of wood go into the whole design. Inside is a highly complex clock with geometric guilloché patterning developed over two years and requiring five months to be produced. The car is powered by a twin-turbocharged 6.6-liter V12 engine to the tune of 593 horsepower and 620 pound-feet of torque. The car beats the previous record holder, a Rolls-Royce Boat Tail, for which one customer paid $29 million.