Białowieża National Park is an oasis of untouched nature in eastern Poland. The primeval forest, one of the last and largest of its kind in Europe, is home to a vast array of flora and fauna, including rare species such as the European bison and the Eurasian lynx. The park’s trails and wooden observation towers are a great way to explore the forest and keep an eye out for its inhabitants. For a unique experience, take a ride on the Bison Express, an old-fashioned train that runs through the park. If you’re lucky, you might even catch a glimpse of one of the majestic bison that roam the park.