Well, there almost is. Mount Rushmore is one of the country's most famous monuments. However, there is an even larger and more spectacular one in the works. The Crazy Horse Memorial is the world's only mountain carving in progress and, when finished, it'll be the world's largest sculpture, standing 563 feet (172m). So far only the face of Crazy Horse, an indigenous Lakota warrior, has been finished and current work continues on his outstretched arm.

Discover the world's most amazing unfinished landmarks

Bizarre but brilliant facts about every US state