Landscape photographs are probably the most popular for wall art images.
They generally suit any room & are great at creating a particular mood or feel.
Getting out into the great outdoors is satisfying enough, but being able to capture nature & the world around us in an image is pretty amazing too. That image can then be shared & the beauty or drama of nature can be viewed by everyone.
Landscape images are so versatile as wall art, like a window to the world.