The Oriental Institute of the University of Chicago created and continually maintains the site. You'll find plenty of examples of geometry in these selected photographs of Hawaiian subjects. Some examples are petroglyphs. These pages are part of a project of the Hawaii Educational Resources Network. A good overview of the Nazca lines is provided at this site.
Some photographs support the text.
This research paper describes various theories, and presents a new one, possibly clarifying the mystery of the Nazca lines. This site details the country of Peru, including location, climate and geography, and its history and people. It also provides an adventure down the Inca Trail and Machu Picchu. The award-winning Ancient Egypt Site is an interactive book about the history and culture of the Ancient Egyptian civilization. It includes a timeline, introduction to hieroglyphics, glossary, bibliography, and reference guide.