Geoglyphs

Geoglyphs are monumental-scaled land sculptures done by arranging stones and/or earth. Geoglyphs can also be carved out of the earth to expose the hidden bedrock beneath the surface. Some of the most well-known geoglyphs are the Nazca Lines and the Uffington White Horse in England.

(http://archaeology.about.com/od/gterms/g/geoglyphs.htm)

Lines of Nazca

(http://paranormaldailynews.com/wp-content/uploads/2010/01/nazca_spider_geoglyph.gif)

Uffington White Horse

(http://www.culture24.org.uk/asset_arena/0/51/73150/v0_master.jpg)