Directly translated to Stone Book, this is much like all the other structures in these areas and times, made out of an enormous slab of granite; 26ft to be exact. This rock contains inscriptions, an initiative prompted by King Nissankamalla who wanted his life, times and deeds recorded literally in stone. The stone itself weighs in at some 35 tons. Interestingly enough, though this stone has travelled far distances (90km+ from Mihintale to Polonnaruwa), exactly why it’s so important hasn’t been deduced so far. So the Gal Potha remains in part a mystery, although the inscriptions have been invaluable for historians piecing together ancient timelines, and have also offered an insight into the evolution of the Sinhala script we know today.