Leonardo da Vinci’s Gear System
This gear system waterwheel and toothed lifting device, based on a design by Leonardo da Vinci, stands in the grounds of his final home, the Château du Clos Lucé, 2 Rue du Clos Lucé, 37400 Amboise, France. In 1965, two lost manuscripts written by Leonardo da Vinci (The Madrid Codices I-II) were discovered in the Biblioteca Nacional de España in Madrid by Dr. Jules Piccus, Language Professor at the University of Massachusetts. Leonardo da Vinci had completed volume I between 1490 and 1499 and volume II between 1503 and 1505. In the first volume, he introduced and dealt scientifically with the idea of transmission by means of toothed gears. His findings are the basis for the gear system in every machine, past or present, that relies upon a gear system.
https://witness.theguardian.com/assignment/5630c6f5e4b07e373ce97a23/1795204

Abandoned Carriage Wheel, Axle And Suspension
I saw this broken, discarded wheel lying in open woodland behind a hotel in which I spent a night shortly after visiting the Château de Fontainebleau, 77300 Fontainebleau, France. It was clearly a heritage piece, well preserved and respected by visitors.
https://witness.theguardian.com/assignment/5630c6f5e4b07e373ce97a23/1795208