At this unique and famous snorkel site in Iceland, you can dive into some of the most transparent water on Earth and see gorgeous blue-green landscapes.

It's just that places like Silfra are really unexpected places to go snorkeling. This dive is not about marine life, though. In fact, it is fresh water from a glacier filling up a fissure between the ...

An curved arrow pointing right. The Silfra fissure in Iceland is the crack between North America and Europe. It is the only place in the world where you can swim between two tectonic plates.