The owner of the cars was a car dealer in the 1970s and 1980s, and decided to save the more interesting cars that came through his doors.

When the barn was full, he padlocked and soldered the doors shut.

I’m not particularly a car guy, but it seems if one was going to go to the trouble of accumulating a collection like that, you’d occasionally dust them.

Via Examiner and Snopes. Photographs by Manuel Menezes Morais.
A partial list of cars in the photos can be found at Sports Car Market.