The derelict (filmed actually at the Brandon Mental Health Centre in Manitoba, Canada) is the unsung hero of Wrong Turn 4 . Unlike the forest, which feels endless and natural, the asylum feels claustrophobic and unnatural. Production designer Anthony Cowley filled every corridor with peeling paint, rusted wheelchairs, and flickering fluorescent lights.
It looks like you’re referencing the movie —likely the "MM" stands for "movie marathon," "media mail," or simply a typo in your search.
Often found on major streaming platforms like Tubi or available for digital rent/purchase on Amazon and Vudu.