A subterranean waterfall courses over rough limestone rocks in the Smoo Cave, Durness wall mural. Smoo Cave, located in Sutherland, Scotland, is a combination freshwater cave and sea cave carved into the side of a large limestone cliff. Photographed by travel photographer David Wall, this underground cave mural is dramatically lit, with sunlight filtering in from the opening of the waterfall above and reflecting off the pool of water below. The muted natural tones of this nature mural, combined with the movement of the water, makes it a great choice for a living room or home study.