Wide variety of things geographical in one sense or another. Alao a lot of depth in available offerings spanning back several issues in almost all areas. Nice interactive games and puzzles.
A mixture of games, simulations, quests, and other educational topics all from a project originally called Games To Teach (archives are available, but notes on the site direct you back to the Education Arcade area. Games in the GTT area are interesting as well -- green games, etc.