By Yasmin Jeffery and Marc Fennell, ABC

On his third voyage, well over two centuries ago, Captain Cook made a detour to Hawaii that would result in his violent demise.

Beneath the sprawling, gnarled branches of a kiawe tree in Hawaii's pristine Kealakekua Bay, an X lies carved into an otherwise unassuming rock face.

But there's no buried treasure to be found here.

This X marks the spot where Captain James Cook was killed by Kānaka Maoli (native Hawaiians) on Valentine's Day in 1779.