4. Kronostky Nature Reserve, Russia
Thousands of acres protected land and not a road in site. This nature preserve is located in remote Far Eastern Russia — closer to Alaska than it is to Moscow. Save from the 3,000 tourists allowed into the park for 5 hours at a time via a pricey helicopter ride, only scientists are allowed to explore this vast, unique landscape. It’s home to the country’s only geyser basin and Eurasia’s highest active volcano. Though you won’t hear much in the way of human activity, the park is home to incredible animals, including some of the largest brown bears on the planet.