Lascaux Cave, France- 

• Official Site of Lascaux

Chauvet Cave, France- 

• Official Site of Chauvet

Pech Merle Cave, France- 

• The Pech Merle Prehistory Center

Neolithic

Ҫatal Höyük, Turkey- 

• Official Site

Stonehenge, England- 

• Official Site

•  Great Buildings: Images and 3-D animated reconstructions

• Archaeoastronomy of Stonehenge

Megalithic sites in Europe-

• Stone Pages: A link to numerous European megalithic sites

• The Megalithic Portal: Maps, browse by country, numerous links

• Avebury Official Site: largest henge in England