Gluggafoss, also known as Merkjárfoss, is a stunning waterfall on the Merkjá River in South Iceland. Its unique feature is the "windows" carved into the soft rock by the flowing water, giving it its name. Over time, the waterfall has changed due to volcanic eruptions and natural processes, but it has now returned to its former glory, making it a must-see destination for nature lovers and waterfall enthusiasts.