Linda Vista Community Hospital in Los Angeles, California. After its closure, the hospital became a popular filming location for horror-themed productions including films, TV shows, and music videos. It has also become the subject of several paranormal investigations.
Do you know what makes the ‘Buffy’ episode 'Nightmares’ even creepier?
It was likely it was filmed in Linda Vista Hospital. I thought about this today when I was watching Becoming Pt 2 when Willow, Cordy and Xander are doing the spell on the hospital bed and according to Wiki, they did film Buffy there.