My kids used to enjoy the PBS show "Where in the world is Carmen Sandiego" and the computer game.
Here's a modern day version using Google Maps. It would be very easy for a teacher to add a couple of clues and then a street view of the landmark to a classroom web page like this:
1. A famous Revolutionary War battle took place here on June 17, 1775.
2. The British Army was victorious, but lost over 800 men
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