Photo: Sigurur Stefnisson — stefnisson.com
The Inspiration: "Growth only come[s] from adversity and from challenge—from stepping away from what's comfortable and familiar and stepping out into the unknown." — Ben Saunders
The Place: Ice Caves; Vatnajökull National Park, Iceland
The Reason to Go: Every winter, tour guides in the local area set out to find new trails and caves to explore with adventure seekers. Since the glacial ice is still active, the natural wonder changes shapes and locations throughout the year, which gives you the possibility of being the first and last person to visit that exact spot again.