Both Tierpark Oberwald in Karlsruhe and the Freigelände des Nationalpark Bayerischer Wald are open 24/7, neither are fenced. So in Karlsruhe you could theoretically watch rocky mountain goats, goitered gazelle and white-lipped deer at midnight. The Freigelände is home to some 30 native species. It must be quite a sight to watch their bears and wolves at twilight.