We used (later purchased) a large Minotaur Maze several years ago at The Science Place, Dallas.  Great kid-friendly attraction, has ability to customize with educational messages, and can be used inside or outside. 
 
Fairly easy to assemble, disassemble and move/change up for frequent visitors.  One caution: kids like to RACE through, so contour it accordingly, and consider posting folks to urge a "slow down" during peak periods.
 
Liz Bleiberg
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