If you loved The Chronicles of Narnia: The Voyage of the Dawn Treader, try The Black Cauldron
A bridge between a film you've already seen and one most people haven't. The Black Cauldron has roughly 4.1× fewer votes than The Chronicles of Narnia: The Voyage of the Dawn Treader — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

The Chronicles of Narnia: The Voyage of the Dawn Treader

The Black Cauldron
What they share
Theysit in Adventure / Family / Fantasy territory. If that's the register that drew you to The Chronicles of Narnia: The Voyage of the Dawn Treader, the second film will land in a comparable space — through a different lens.
What The Black Cauldron is
Medieval landscape, summer solstice, a rusty gate creaks. A young pigkeeper's daydreams of valor are disrupted by the kidnapping of his prophetic pig Hen Wen, taken by the dark lord Horned King. This darker Disney effort holds up surprisingly well on a rainy afternoon.