yjafjallajökull, Iceland (17/20)

Iceland is home to some of the world’s most active and visually stunning volcanoes, and Eyjafjallajökull is perhaps the most famous. In 2010, this glacier-covered volcano made headlines when its eruption caused massive disruptions to air travel across Europe. Today, visitors can explore its volcanic terrain, hike its slopes, and visit nearby waterfalls like Seljalandsfoss, all while witnessing the dramatic power of Iceland’s volcanic landscape.