From impassable terrains to unstable political situations to strict visa regulations, there are some places on Earth that are nearly impossible to get into. Fortunately, these adventurous photographers dared to venture into these territories!
Unless you've been under a travel rock for the past couple of years, you've probably heard about the discovery of Hang Sơn Đoòng (HSD), the largest cave in the world. The good news? It's now open to explorers.