Waterfalls occur in nature when iceberg melt drops over the edge of rock formations, or in the upper course of a river. Niagara Falls might be the most powerful falls in the country, but these naturally occurring wonders appear everywhere in the world in virtually unlimited configurations. The most famous use of a waterfall in architecture may be Falling Waters by Frank Lloyd Wright, but backyard designers have incorporated these features into backyards for decades. Utilizing both natural and artificial materials and structures, waterfalls can enhance the design and provide ambient noise when necessary.