Bright it is, but what is the source of its glow? Solve that question, and you just might figure out what national park Mystery Photo is.
But to correctly answer this mystery, we need to know not just what the image is of, but where it was taken. Stumped? Check back tomorrow for the answer.
Comments
Tomp2 got it, but we hid his answer to give others a shot.
Lava from Volcanoes National Park, Hawaii
Looks like a "skylight" in Hawaii Volcanoes NP. Probably from a lava tube flow from Pu'U'Oh'O'.
I think it's looking down into a lava tube at the lava flowing inside. Taken at Hawaii Volcanos National Park.
Anon 8:14, Blackfeet Dreamer, and Anon 9:15 also ID-ed the photo.