Arca Floating Hotel, Danube Delta, Romania | This three-story riverboat traverses the world’s largest wetland reed beds, where golden jackals, European minxes, and millions of birds all live. Packages from US$165. hotelplutitor arca.com
Kolarbyn Ecolodge, Bergslagen Forest, Sweden | Tours of northern Hälsingland province, where wolves, bears, and wolverines roam, start at this primitive hotel. Packages from US$700. wildsweden.com
Linden Tree Retreat & Ranch, Velebit Mountains, Croatia | Head to this 50-acre sanctuary for bears, undomesticated cattle, wild horses, and Balkan chamois. Rooms from US$60 . lindenretreat.com
Villa Quintiliani Hotel, Central Apennines, Italy | Steps from this converted mansion is Wildlife Adventures (wildlife adventures.it), which offers trips into the forest to see Marsican brown bears. Rooms from US$130. villinoquintiliani.it
Wild Farm, Rhodope Mountains, Bulgaria | More than 150 bird species,…