Millions of dollars were spent at the auctions that were held during the lead up to this year's Pebble Beach Concours d'Elegance, but what did those lofty sums buy? Quite a few tremendous machines. We've already highlighted some of the largest transactions that took place during the posh classic car gathering, but below is a list of the top 10 most expensive cars sold during Monterey Car Week. Ready for your eyes to water?

1950 Ferrari 166M/212 Export Uovo

1950 Ferrari 166M/212 Export Uovo

1950 Ferrari 166 MM/212 Export "Uovo" — Sold for $4,510,000 by RM Sotheby's

If a vehicle consignment comes with the phrase "one-off," it's bound to fetch a pretty figure. The 1950 Ferrari 166 MM/212 Export "Uovo" is no outlier. "Uovo" means "egg" in Italian, and was the nickname given to this Ferrari for its odd shape. It was built and raced by the Marzotto brothers, a duo that would prove incredibly important for Ferrari. Not only did they keep the infant sports car maker afloat, but they also helped Ferrari make a name for itself at the racetrack.

1959 Ferrari 250 GT Series I Cabriolet

1959 Ferrari 250 GT Series I Cabriolet

1959 Ferrari 250 GT Series I Cabriolet — Sold for $4,840,000 by Gooding & Company

Built by Pininfarina, this 1959 Ferrari 250 GT Series I Cabriolet was the final chassis number to roll out of the coachbuilder's workshop. All 250 GT Series I Cabriolets featured more mature components for Ferrari's top clients. Only 40 examples were ever built.

1959 Ferrari 410 Superamerica Series III Coupe

1959 Ferrari 410 Superamerica Series III Coupe

1959 Ferrari 410 Superamerica Series III Coupe — Sold for $5,335,000 by RM Sotheby's

Another Ferrari blessed by Pininfarina, this 1959 Ferrari 410 Superamerica Series III Coupe is just one of 12 built. The race-inspired design is enhanced by the 400-horsepower V-12 engine under the hood. It's also painted in an obscure color for a Ferrari: British Racing Green with yellow stripes.

1955 Ferrari 121 LM Spider by Scaglietti

1955 Ferrari 121 LM Spider by Scaglietti

1955 Ferrari 121 LM Spider by Scaglietti — Sold for $5,720,000 by RM Sotheby's

It's a vintage Ferrari race car, so it's no surprise that this one commanded millions. One of four ever made, the 121 LM Spider featured a Ferrari inline-6 engine making 361 hp. This car has its original engine and transmission still in place and in working order.

1959 Aston Martin DB4GT Prototype

1959 Aston Martin DB4GT Prototype

1959 Aston Martin DB4GT Prototype — Sold for $6,765,000 by RM Sotheby's

Not all of the big bucks auction cars were Ferraris. This 1959 Aston Martin DB4GT Prototype was the brand's attempt to create a lightweight competition version of the DB4 grand tourer. It was a design project for the automaker, and it retains its original engine. Seeing that it's a prototype, yes, only one exists.

1961 Ferrari 250 GT SWB Berlinetta by Scaglietti

1961 Ferrari 250 GT SWB Berlinetta by Scaglietti

1961 Ferrari 250 GT SWB Berlinetta by Scaglietti — Sold for $8,305,000 by RM Sotheby's

Back to our regularly scheduled Ferrari programming. Few cars are as revered in Ferrari history as the 250 GTO, and for good reason: the various versions are absolutely stunning. This one is an all-original, numbers-matching 250 GT Berlinetta, and that's all one needs to know to understand why it went for such a high sale price.

1970 Porsche 917K

1970 Porsche 917K

1970 Porsche 917K — Sold for $14,080,000 by Gooding & Company

If this car looks familiar, it's because it's been immortalized on film forever. This Porsche 917K was the star car of Steve McQueen's "Le Mans" film. Although it never actually won any races during its time, McQueen's name and the car's rarity certainly inflated the value. The fact that it is one of the legendary Porsche 917s didn't hurt, either. With its sale price, it became the most-expensive Porsche ever sold.

1966 Ferrari 275 GTB/C

1966 Ferrari 275 GTB/C

1966 Ferrari 275 GTB/C — Sold for $14,520,000 by Gooding & Company

When it comes to collectible Ferraris, racing provenance helps auction values. This Ferrari race car, one of 12 275 GTB/Cs ever built, took home numerous victories during its stint in motorsport between 1966 and 1970. As you likely guessed, the "C" stands for "Competizione."

1995 McLaren F1 for sale at Bonhams auction

1995 McLaren F1 for sale at Bonhams auction

1995 McLaren F1 — Sold for $15,620,000 by Bonham's

One of seven McLaren F1s actually federalized and road-legal in the United States, this example was highly sought after. In fact, it's only one of 64 examples that are street legal around the world. With just 9,600 miles on the odometer, you can bet that 627-horsepower 6.1-liter BMW-sourced V-12 is just as strong as ever.

1956 Aston Martin DBR1

1956 Aston Martin DBR1

1956 Aston Martin DBR1 — Sold for $22,550,000 by RM Sotheby's

Finally, the one to top them all. Not only did the 1956 Aston Martin DBR1 make waves at Pebble Beach, but it became the most expensive British car ever sold. The DBR1 has an incredible racing lineage and this particular car, chassis 001, took the podium at numerous motorsport events, including the 1959 Nürburgring 100 Kilometer race. It's all original, and some pretty impressive names have piloted the racer in the past.