CNN  —  In the Faroe Islands, wild, unpredictable weather — fierce winds and rain, and thick fog that settles like a curtain — can sometimes make travel by car or ferry problematic. No wonder the Faroese love their tunnels. They’ve built 17 of them on land and four subsea — including the world’s only subsea tunnel with a roundabout that’s underwater. The network makes for easier navigation of the self-governing island nation within the Kingdom of Denmark . “Though we are 18 islands, we often