The new Mercedes-Benz Maybeck S 600 unveiled at the 2014 L.A. Auto Show.

The new Mercedes-Maybach S600 is not just the biggest vehicle in the German maker's luxury line-up, it will also be the most expensive when it reaches showrooms next year.

Measuring nearly 18 feet, nose-to-tail, with a passenger compartment better suited to a private jet, the big sedan is expected to begin somewhere north of $250,000, and with extensive customization, some versions are likely to nudge closer to $1 million.