Photograph an ancient alien city enveloped in thick, swirling fog, with towering spires and strange architecture partially visible, and the faint outlines of floating, ethereal beings drifting through the mist; use a 120mm telephoto lens to focus on the details of the city and the ghostly shapes, set the aperture to f/8 for a deep depth of field, use a slow shutter speed of 1/30s with a tripod to capture the low light, set ISO to 100 to minimize noise, and adjust the white balance to enhance the eerie tones of the scene, creating a sense of wonder and mystery.