Astronaut in Alien Megastructure

ATMOSPHERIC illustration of a lone astronaut standing inside an abandoned alien megastructure on a distant moon, the interior of the structure is an impossibly vast cathedral-like space with smooth organic walls covered in faintly glowing alien hieroglyphics in turquoise, massive curved support columns rising hundreds of meters to an arched ceiling with a circular opening revealing a gas giant planet and its rings in the sky above, dust motes floating in the alien light, the astronaut's helmet flashlight creating a small warm cone of light against the immense cold blue alien glow, Prometheus meets 2001 A Space Odyssey aesthetic.