🇪🇸 Spain · Ancient technology
Atlantropa – Herman Sörgel's 1928 Hydro-Power Mediterranean Tech Utopia
1928 proposal to 1952 project's death; included here as hypotethical ancient-tech analogue · Weimar–Nazi technocratic utopia
1928 Atlantropa Gibraltar dam lowering Med 200 m — included as modern megadam mirror for 'what Atlantis tech would look like'.