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Impressive... Very nice.
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Always thought pivot irrigation farms looked cool. Picsrel: Aerial views of Orania, sprawling PIFs in rural Kansas
Also, while on the subject of circular cities: Nördlingen! A perfectly circular German mediaeval town built inside of a meteor crater, now known as 'die Rieskrater'. 
And while we're on the subject of curious mediaeval cities, supposedly Bologna Italy had skyscrapers during the Renaissance.