Although these were designed specifically for GIS day during Geography Awareness Week, these 2 excellent map-based treasure hunts from ESRI are great any time of year. The answer to the question will only pop up in you are zoomed in the the right region (SHIFT + Make a box = Zoom to area). These links will take you to the World Cities quiz and also to the Mountains quiz.
Free travel tip and photos from all over the world...
This map is not a professionally produced map and that is the beauty of this website. Virtually anyone can make a 1-feature world map by simply clicking on a checklist all of the countries you want highlighted on your map. Second, open the file and add some text and a few lines to label it. This took less than 20 minutes to make with no need for any cartographic or GIS experience (this PNG didn't compress well, the full image of this map can be seen here).
We have recently been publishing a series of articles on Google Docs. The purpose behind this series is to make teachers and educators aware of the potential of this free service. You can consult this link if you have missed the previous publications.