If you're looking for a hidden gem off the beaten path in Iceland, check out Nauthúsagil! This narrow ravine is located beneath the Eyjafjallajökull glacier and is a true natural beauty. With waterfalls, a wild rowan tree, and a rich history, it's a unique hiking experience that requires some caution due to slippery rocks. Be sure to hold on to the chains and ropes provided while traversing through.