Diver in the Silfra, Thingvellir Lake, Thingvellir National Park, Iceland (© Wild Wonders of Europe/Lundgren/Corbis)
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- Below the surface, it appears to be a dive to the center of the Earth.""Back on dry land, it\s a gorgeous lake
- Divers here are rewarded with remarkably high underwater visibility...""And bragging rights for swimming in a geologic rift between continents
- The park surrounding this lake was once the site of its country\s parliament, dating to 930 A.D.""Today it\s a major tourist attraction
- This placid scene is where the North American and Eurasian tectonic plates collide.""It\s an explosive smash-up
