The ancient winery was uncovered in the village of Mi’ilya in northern Israel, which was also the site of a castle built by King Baldwin III of Jerusalem in the 12th Century.
A woman who saw archaeologists working on the castle asked for a privately funded dig under her own house, and that is where the winery was discovered.
Israeli newspaper Haaretz reported that the winery was unusual, because it had two treading floors for crushing grapes, instead of one.
A Roman-era pit was discovered next to the treading floors.
The owner of the house, Salma Assaf, has built a restaurant with a glass-panelled floor on top of the winery to attract tourists, said Haaretz.