How the quarrelsome ‘Jena set’ paved the way for Hitler
Today, the German city of Jena, 150 miles south-west of Berlin, is the world centre of the optical and precision industry; but in the 1790s it spawned an even more marketable commodity. It was then a small medieval town on the banks of the river Saale with crumbling walls, 800 half-timbered houses, a market square