When I was 12-years-old, I discovered Creature Feature, a broadcast horror show featuring classic Universal Horror movies like Dracula (1958), Frankenstein (1931), and The Wolf Man (1941) amongst other classic horror flicks not associated with Universal. Ever since then, I've been enthralled with all things spooky.
1. The Haunting (1963)

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2. The Silence of the Lambs (1991)

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3. The Witch (2015)

4. Frailty (2001)

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5. The Blackcoat’s Daughter (2015)

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6. Fallen (1998)

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7. Paranormal Activity 1 & 2 (2007 & 2010)

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8. What Ever Happened to Baby Jane? (1962)

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9. Sinister (2012)

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10. And lastly, The Descent (2005)

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I hope you all enjoy my suggestions!
A couple honorable mentions include:
Oculus (2013)
Midsommar (2019)
Hereditary (2018)
The Strangers (2008)
The Ring (2002)
The Conjuring (2013)
Get Out (2017)
Shutter Island (2010)
The Sixth Sense (1999)