Talk about hitting the jackpot.

A car collector in Texas has discovered five classic pre-World War II cars stored for nearly four decades in a barn.

The collector, Antonio Brunet, chairman of Motostalgia Auctions, is helping the owner of the classic rides take them to auction next month where they're expected to sell for more than $700,000, according to Fox News.

"It's the Holy Grail for a car guy," said Brunet, who works just seven miles away from where the cars were being stored, according to the news outlet. "Opening the doors, seeing the cars covered in dust, untouched for years, it's like you're in a time machine."

The collection includes: 1938 Cadillac Series 90 V-16 Fleetwood Limousine, 1937 Kozy Coach Travel Trailer, 1933 Cadillac Model 370C V-12 Town Coupe, 1932 Cadillac 370B V-12 Victoria Convertible, 1923 Milburn Electric Model 27L and a 1908 REO Model G Boattail Roadster/Sedan Tonneau.

The rarest car of the collection is a No. 1 1932 Cadillac 370B. Only four Victoria convertibles were built for that model year and just one with a V-12, according to Motostalgia. The ride could sell for as much as $350,000 next month.

"It was used as a prototype to show executives to see if they would approve the concept of a Victoria convertible," said Brunet.

The owner, identified as Jack, moved to Texas from Wisconsin around 1972 and put the vehicles away in his new barn with the intention of selling them someday. He just never got the money to repair them.

"Jack's dream was to see them back on the road," Brunet said. "So by giving us the honor of putting them in our auction, we promised to bring them back to life."

Even though the rides aren't a typical "barn find," Brunet and the owner are still excited for next month.

"The final chapter of a magnificent story," Brunet said.

The cars will be sold on June 12 at Indianapolis Motor Speedway.

See Now: OnePlus 6: How Different Will It Be From OnePlus 5?