Rick Steves' Europe on Instagram: "The Blue Lagoon is a steamy oasis—a sprawling hot-water playground for grown-ups. Chunky rocks disappear beneath the opaque water, where they’re coated with white silica slime. The naturally heated water is thoroughly relaxing. You’ll smear mineral deposits on your face while giggling at your fellow silica-masked bathers. Arguably Iceland’s most famous attraction, the Blue Lagoon is tucked into a jagged volcanic landscape in the middle of nowhere, about a 45-mi