Gásadalur Waterfall in the village of Gásadalur in the Faroe Islands. The Faroe Islands are an island group under the sovereignty of the Kingdom of Denmark, approximately halfway between Norway and Iceland.
Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.