A large monolith-like building, with vents but no windows, atop the summit of a mountain.
https://cdn.masto.host/federatesocial/media_attachments/files/113/776/545/562/387/418/original/f6809e1fb4d6de5d.jpg
AN/FPS-24 Radar Tower, Mt. Umunhum, Los Gatos, CA, 2024.
Several additional pixels at https://www.flickr.com/photos/mattblaze/53796724938
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