Seljalandsfoss Waterfall is a must-see spot in Iceland, located on the South Coast just a couple of hours from Reykjavik. It's famous for its unique pathway that lets you walk behind the waterfall and get up close to the cascading water. The waterfall originates from underneath the Eyjafjallajokull glacier and is surrounded by stunning natural scenery. Make sure to check out the nearby Gljufrabui waterfall too, which is often overlooked but definitely worth a visit. Don't forget your camera for some epic shots!