It is a crisp cold day and the sun is glistening off fields blanketed with fallen snow.   About an hour’s drive from Weimar, and after a sodden winter in the UK, it is magical traveling under piercing blue skies with stinging, fresh air hurting my lungs.  This pain is good. Pony in field near Mittelpunkt – the centre of Germany We are on our way to an ancient Thüringen forest in Central Germany – between Mühlhausen, Bad Langensalza and the Wartburg city of Eisenach.  It was a