Any interesting and spooky places to visit in western Cornwall?

I'm going for a long weekend to St Ives next weekend and am looking for any recommendations for any caves, castles etc. with interesting legends or reputed hauntings and such.

We want to give the weekend a "Scooby Doo" feel, as we're going down in a minivan.

Answers:
At Boscastle there's a witchcraft museum.
Check out the Jamaica Inn, plenty of hauntings in there.
jamaica inn could be worth a visit, but thats in eastern cornwall. dartmoor (in devon) is good for that kinda thing
go to zennor ,you might meet the famous mermaid

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