This fabulous photo …
… was captured by Santiago Borja and published by National Geographic.
It is a gigantic cumulonimbus cloud (the kind that pilots are ever vigilant to avoid, especially during summer) over the Pacific Ocean; the photo was taken from about 37,000 ft.
The photographer captured this shot during one of the lightening flashes emanating from the cloud.
As a pilot, I have taken what I consider to be rather interesting pictures from aloft, but I have nothing even approaching this.
The original article can be seen here: https://www.nationalgeographic.com/photography/proof/2017/04/your-shot-unbelievable-landscapes/