Yep, I second the Aaron Becker trilogy:
- Journey
- Quest
- Return
Other magical adventure-themed PBs (my favourites tend to be wordless) :
- The Only Child by Guojing
- The Garden of Abdul Gasazi by Chris Van Allsburg
- And pretty much anything by Chris Van Allsburg like Polar Express, Jumanji etc.
And if you're up for a graphic novel, I highly recommend:
- Around the World by Matt Phelan