It did not strike me till the guide at Hampi told me so.
Karnataka has three types of rocks: a) Soap Stone, b) Granite, and c) Sand Stone.
Hampi (a UNESCO World Heritage) ruins are made of Granite.
The temples of Pattadakal (a UNESCO World Heritage) and the Badami Cave temples are of Sand Stone.
The temples at Belur and Halebid are made of Soap Stones.
Follow the stones and you would have covered a considerable part of Karnataka's tourism offerings.