Lamborghini recently treated the world to a couple of unexpected, though very much welcomed surprises, the Aventador-based SC18 and the Urus ST-X racing SUV. Both are wonderfully nuts, as any self-respecting Lamborghini ought to be. But Lamborghini, partly thanks to an influx of VW Group cash and increased sales in general, pumped money into several limited build hypercars over the past decade at a rate previously unseen in its 55-year history. Making money instead of losing it has countless benefits. Of course, these limited edition hypercars were sold at a premium price to only select customers.

Another interesting thing about the SC18 is that it was the first time the Italian carmaker's Squadra Corse motorsport division was directly involved in a one-off. Could there be more to come? Probably. Given Lamborghini's recent history, these future one-offs and limited build hypercars are only going to become even crazier. So without further ado, here are ten of the wildest limited edition Lamborghini road and track cars of the past decade, in no particular order.

Terzo Millenio

First things first: the 2017 Terzo Millenio concept is not a road car. It doesn't even have a conventional internal combustion engine. Instead, its power comes from high-capacity supercapacitors. No batteries required. There's an electric motor at each of the four wheels, hence their orange glow. The amount of torque at each wheel can also be controlled individually, just like it's done in Formula 1 cars. Above all, the Terzo Millenio is a one-off vision of the future, beyond the upcoming Aventador successor. What will the world of supercars be like once internal combustion is banned?

Lamborghini is already preparing for that day by teaming up with the Massachusetts Institute of Technology to design and engineer this wild concept. Although it may look like a futuristic Lamborghini from the outside, its inner technology is beyond what's available for sale today.

Sesto Elemento

The Lamborghini Sesto Elemento remains one of our favorites. Always will be. Not only was it a styling preview for the Huracan, the Sesto Elemento was a lightweight construction experiment involving advanced carbon fiber technology when it debuted in 2011. Total curb weight: 2,202 pounds. Thanks to this and its naturally aspirated 5.2-liter V10 with 570 hp and all-wheel drive system, it made the sprint to 62 mph in only 2.5 seconds. Only 30 examples were built and were quickly sold. Why the name 'Sesto Elemento'? It refers to the atomic number of carbon, the sixth element, because of the extensive use of carbon fiber. So, how much did this awesomeness cost? Roughly $2.92 million each, and it wasn't even street legal.

Reventon Coupe and Roadster

At the very end of the Murcielago's 10-year production cycle, Lamborghini presented the Reventon in late 2007. It was the most expensive Lamborghini to date until the Sesto Elemento arrived only a few months later. Only 21 examples of the coupe were built, one of which one was retained for the Lamborghini museum. Another 15 roadsters were made following its 2009 release. 'Reventon' means 'small explosion' in Spanish and its 6.5-liter V12 with 641 hp and 487 lb-ft of torque is proof of that.

Although the Aventador is its official successor, the Murcielago-based Reventon sprinted from 0-62 mph in 3.4 seconds and achieved a top speed of over 211 mph. With exterior styling inspired by the F22 stealth fighter jet, the Reventon became an instant classic and a highly sought-after collectible. Be prepared to spend close to $1.5 million for one today.

Aventador J

Only six months after the Aventador had its world premiere Lamborghini unveiled the Aventador J. Its overall formula was rather simple: remove the roof and windshield, and add additional aerodynamic components. The result was Lamborghini's then most radical open-roofed mode to date. And yes, it was designed to be fully drivable on the road, though we figure there'd be some safety issues with the local DMV. Lacking a windshield could be a cause for concern.

Like the newly introduced Aventador, the one-off Aventador J was powered by the same 6.5-liter V12 with 700 hp. Without the roof, windshield and air conditioning (not like it's needed), total weight came to 3,472 pounds. After its motor show days, Lamborghini decided to sell the Aventador J instead of keeping it as part of its private collection. Someone ended up paying $2.8 million for it. Word has it that, upon seeing it, a rich Arab ruler commissioned another one and paid an unknown price for it.

Veneno Coupe and Roadster

This is one of those love it or hate type of deals. The Lamborghini Veneno coupe and roadster, revealed in 2013 and 2014, respectively, were part of the carmaker's 50th-anniversary celebrations. Just five Veneno coupes were built, although only three were put up for sale for $4.5 million a pop. The remaining two were for factory testing and the company's museum. By contrast, a total of nine roadsters were built, all of which were sold prior to the official reveal.

Once again using the Aventador and its 6.5-liter V12 as a base, power increased from 700 to 740 hp thanks to enlarging the air intakes and an improved exhaust system. As for its wild styling, Lamborghini says it was inspired by LMP1 endurance race cars, while its angled rear wheel arches pay tribute to the Countach. And in case you're wondering, the name Veneno, meaning 'Venom' in Spanish, was taken from a famous fighting bull, as are most Lamborghinis.

Centenario Coupe and Roadster

To commemorate the 100th birthday of Ferruccio Lamborghini in 2016, the team running his car company wanted to do something special. Nothing too extreme (for Lamborghini, mind you), but a supercar that was still above and beyond the norm. The Centenario coupe and roadster were the result.

Both debuted in 2016 and, not surprisingly, were based on the Aventador. Only a V12-powered model could be used to celebrate an occasion such as this. This time, however, the 6.5-liter V12 produced more power, rated at 759 hp, and greater acceleration with a 0-62 mph time of 2.8 seconds and a top speed of 217 mph. Lamborghini claimed both body styles had equal performance. All told, only 20 examples of each were built, and all were sold even before the official public unveiling.

Egoista

Yes, we know the Lamborghini Egoista was a concept, but it still has significance for the brand. Built to celebrate Lamborghini's 50th anniversary, the Egoista was based on the Gallardo but was intended to be the most extreme Lamborghini to date. Only one example was built, which is now permanently parked at the Lamborghini museum. So, why is it so extreme? It features a one-seat cockpit with a fighter jet-inspired canopy door. The steering wheel has to be removed in order to enter and exit. Even the body and wheels were constructed of antiradar materials in line with its fighter jet influence. Powered by a 5.2-liter V10, the Egoista's design inspiration is actually kind of violent, that of a bull ready to charge right at you. And in case you're wondering, Lamborghini has no intention of selling it.

Estoque

The Estoque, the Lamborghini sedan that never was and likely never will be. Back in 2008, Lamborghini was toying with the idea of expanding its two-car lineup beyond the typical coupe and roadster. Could a modern Lamborghini also be a sedan? Hey, it was worth a shot, and so the Estoque concept was ordered. It premiered at the 2008 Paris Motor Show to generally positive reviews. Under its hood was the familiar 5.2-liter V10 paired to a seven-speed dual-clutch gearbox. It didn't take long, however, for Lamborghini to realize the sedan market wasn't the best fit. Instead, it shifted focus to developing its second SUV, the Urus. It's kind of a shame, really, because the Estoque looked amazing. Even if it was produced in limited production numbers, it would've achieved instant fame as the greatest high-performance sedan in the world.

Asterion

There were many rumors claiming the Lamborghini Asterion grand tourer concept was heading for production. It even looked almost production ready when it was revealed back in 2014. Only it didn't happen, which was really a shame. How come? Because of its hybrid technology. Then-CEO Stephan Winkelmann claimed it was not good enough for Lamborghini customers because it didn't add to the performance. Just because the car was more fuel efficient and had a limited electric range didn't make it a good Lamborghini. Hybrid technology can also be used to improve performance, as was done with the McLaren P1 and Porsche 918 Spyder. Like the Estoque, the Asterion was ditched to put more focus on the Urus SUV.