Students studying Ancient Egypt may experience the same head-scratching as the experts in this story when looking at the hieroglyphs on the British Museum Compass website (www.thebritishmuseum.ac.ukcompassindex.html). The Children's Compass page helps to decipher images.
For the same kind of challenge, with help provided, pupils can look at a medieval cartoon about Jews in the 12th century
Pupils can have an interesting time studying more recent examples of code-cracking or failures to crack codes. The contribution by the Navajo to US naval communications in the Second World War is easy to research online, as is the story of the Enigma code.