This activity book has a section where you decode ancient symbols.
ArchivesLast Kids on Earth
Last Kids on Earth Series by Max Brallier 10 Books Collection Set -Ages 8-12-PB
You will find that this activity book has enough content for weeks of fun.
Lot of 8 ~The Last Kids on Earth~Max Brallier~#1, 2, 3, 4, 5, 6, 7, 7.5
You will find that this novel wraps you in its world completely.
The Last Kids on Earth Book Lot Of 8 Hardcover Max Brallier 1,2,3,4,5,6,7,7.5
A nice touch is the illustrated author bio at the very end.