Hang Sơn Đoòng Cave: A Glimpse Into the World’s Largest Cave

Man standing in front of the entrance to Hang San Doong cave in Vietnam.

Concealed within the verdant jungles of central Vietnam lies a natural marvel that continues to inspire awe among explorers and adventurers: Hang Sơn Đoòng, the world's largest cave. (Image: Linhcandng via Wikimedia)

Explore White Pocket: A Geological Wonder in Arizona

Vermilion Cliffs National Monument.

While it is hard even for geologists to explain the formation of White Pocket, they estimate that the structure has existed since the Jurassic period. (Image: Glebtarro via Dreamstime)