Photo Modified: Flickr / Shriram Rajagopalan / CC BY 4.0

The Silfra fissure is famous for being one of the world’s best dive sites because it’s actually a crack between the North American and Eurasian continents. It is the only place where you can dive or snorkel right where the continental plates meet and drift apart about less than an inch per year. It’s also known for its incredible underwater visibility — over 330 feet. This creates an experience that can hardly be beat.