This little known rock cut temple was carved out of single piece of granite stone.
Even today when we have diamond tipped cutting tools it’s a difficult task to carve granite. It's an example of incredible engineering from more than 1300 years ago, and the detail still baffles scholars today.
http://bulcranium.blogspot.com/2013/07/7th-8th-century-vettuvan-koil-temple.html