Sightseeing spots in Sado

What are the must see sightseeing spots on Sado island? I'll be visiting Niigata and want to know if I should visit Sado too.

 

There are shrines/temples, old mines, and beautiful scenery to be seen on the island. I really recommend it. The official website has more details on what you can see there. https://www.visitsado.com/en/view/