Koenigsegg CC850 – $3.7 millionBuilt to commemorate both twenty years of Koenigsegg car production and its founder's 50th birthday, the CC850 combines retro styling with cutting-edge technology. It's inspired by the CC8S, the first production Koenigsegg model which was at the time the most powerful production car ever made. Originally, 50 units of the CC850 were planned, but after exceptional demand for the car, production was expanded to 70 units. This demand came despite the car being one of Koenigsegg's priciest cars to date, with a $3.65 million starting MSRP. Most owners reportedly preferred to add plenty of custom options too, which drove the price even higher.The CC850 matches the 2014 One:1's power-to-weight ratio, weighing 1,385 kilograms (3,053 pounds) and producing 1,385 horsepower. The minimal exterior design also pays homage to the brand's older models, even if the oily bits and tech underneath are all new. A particular highlight of the new tech is the nine-speed automatic transmission, which can transform into a simulated six-speed manual, complete with a gated shifter. This gives drivers the option to choose between both transmission types, with the car able to instantly switch between the two modes. Koenigsegg has claimed that when in manual mode, the car will behave just like any other car with a manual transmission, and so can be mis-shifted or stalled if the driver makes a mistake.Zenvo Aurora – $3.9 millionDanish outfit Zenvo first burst onto the scene in the late '00s with the ST1, and since then has been busy producing various limited-run versions of both its ST and TS-branded hypercars. The company recently announced its most ambitious car to date, a hybrid V12-powered model called the Aurora. Many manufacturers are in the process of retiring their V12 engines as stricter emissions regulations make them unsustainable, but Zenvo has taken the opposite approach. Its 6.6-liter quad-turbo V12 is all-new, developed by Mahle Powertrain and pushing out 1,250 horsepower. In addition, three electric motors make 200 horsepower each for a combined total output of 1,850 horsepower.A battery pack also ensures the Aurora can drive short distances on electric power alone, with a reported 21 miles of range on offer. Two variants of the car are available, each with a distinct aim: the Aurora Tur is designed to be the brand's ultimate high-performance tourer, while the Aurora Agil is built primarily for the track. No matter which variant buyers pick, prices start at roughly €3.6 million, which equates to around $3.9 million at the time of this writing.Like many of the other cars here, most buyers' final bill will likely come to significantly more than that once custom options are included.Pagani Zonda HP Barchetta – $17.7 millionThe most expensive Pagani made to date cost €15 million, roughly $17.7 million at the time of its unveiling. The clue to its staggeringly high asking price lies in its name – the "HP" stands for Horacio Pagani, the founder of the Italian marque. The Zonda HP Barchetta was his personal project, made to his exact taste for his collection. Alongside the example built for Mr. Pagani, two other examples of the car were produced, each sporting an unprecedented MSRP.The HP Barchetta features some unique design touches over a "regular" Zonda — if there is even such a thing, as several dozen special edition variants of the car exist. Nonetheless, the most expensive Zonda is different from the rest, with partially covered rear wheels, a smaller windshield, and a unique roof scoop. It was unveiled in 2017, long after standard Zonda production was stopped, and close to two decades after the original Zonda C12 was unveiled in 1999.