Although these were designed specifically for GIS day during Geography Awareness Week, these 2 map-based treasure hunts from ESRI are excellent.  The answer to the question will only pop up in you are zoomed in the the right region (SHIFT + Make a box = Zoom in to that area).  These link will take you to the World Cities quiz and also to the Mountains quiz.

See on storymaps.esri.com

10commandments