Old adventure movie with ghosts in a castle

I remember this old movie that I used to watch all the time at my gandparents house. It was old, probably somewhere between 50’s – 60’s range and in colour. I can’t remember much about it but I do remember near the end. The hero has captured some kind of trickster (a leprechaun I think) and put him in a glass jar. They are in a small boat at the bottom of a cliff. The hero climbs the cliff and on top is a scary castle. There are ghosts floating around (pale blue and screaming, wailing etc). Inside the castle is a mirror or portal or something. That’s all I can remember. Any help would be greatly appreciated.

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