Seljalandsfoss is a rad waterfall in Iceland that drops 60 meters and lets you walk behind it into a cool cave. It's located in the South Region, near Route 1, and originates from the volcano glacier Eyjafjallajökull. Some folks got all riled up about plans to build a big info center nearby, but Seljalandsfoss remains a popular spot for tourists and even made an appearance in The Amazing Race and Justin Bieber's music video. So, if you're ever in Iceland, don't miss out on checking out this epic waterfall!