It has been nicknamed Europe’s prom queen, and with hardly 334,000 residents, it attracts millions of visitors annually. Among its attractions are an underground spa, a huge 62-room luxury hotel, and a signature restaurant. One of its hotels is set to be categorized as an adults-only affair. Iceland is largely uninhabited and the scenery keeps changing regularly. Tourists can go chasing the Northern Lights and enjoy waterfalls, geysers, or the hot lagoons.