Note I didn't say the most expensive, although I doubt there are bigger pricetags. This is the very famous 'first' Rolls-Royce, called the "Silver Ghost" and it was introduced in 1906.
Currently it is owned by Bentley Motors, and lives at the Crewe works. Rolls-Royce made almost 8000 of these cars, which were originally fitted with a 7-litre, six cylinder side-valve engine, producing 48hp!
The insurance forms have it valued at GBP£40 million (AUD$63 million)!
I took this photo on the 18th hole at Pebble Beach, California.