Old Children's Book

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I'm looking for an old children's book that I remember looking at in the 90s. I can barely remember it.

What I remember:
>About a quarter inch thick.
>Involves some kind of journey in a ship or airship.
>Mostly illustrations.
>Has a scene at the docks.
>Involves a guy and his grandfather or uncle maybe.
>At the end, they think they are in the jungle, but realize they ended up in a zoo.

pic unrelated.