Favorite Horror Movies Based on Atmosphere/Vibe

Many horror movies use jump scares or gore. However, there's also a category of horror movies that doesn't rely on these aspects and mostly use a scary atmosphere or vibe. Atmospheric horror movies seem to have (re)gained more popularity recently. What is your favorite horror movie that doesn't just rely on gore or jump scares, but mostly has a scary atmosphere or vibe?

After voting, please discussion here.