Our real estate sources tell us the homeowners accepted an offer Wednesday -- the last day for bids to be submitted for the Georgia estate -- and the home is under contract. The place went on the market with a $1.5 million asking price just over a month ago. The agents are being tight-lipped on the buyer's identity.

The Victorian-style "haunted house" is featured in "Stranger Things" season 4 as the Creel family home and Vecna's lair in the Upside Down ... and it was originally built way back in 1882, but it's undergone extensive renovations.

The main house has 6 bedrooms and 5 bathrooms ... and there's a separate guest house in the backyard of the one-acre lot.

The property is in Rome, GA and it was once a very successful bed and breakfast before its Netflix fame.

Producers for "Stranger Things" used exterior shots of the home, plus some of the interior ... and the house was also recreated on a sound stage near Atlanta.