Visit the bat metropolis - Josefov fortress

One of the most extensive underground defense systems in Europe, built by Josef II. near Jaroměř, ultimately avoided direct fighting. Today, the unique fortress town attracts not only many visitors, but also rare winged mammals. Every year, more than a thousand individuals winter here in the extensive underground corridors - mainly small hornbills, but also other types of birds. The Josefov underground is a European…