A search on 'stonehenge' using popular search engines will return numerous sites offering the same information regarding location, design, construction, history and how to get there. Listed below are links to some of the more unique views on the subject together with reference material encountered during research for The Stonehenge Observatory.

   
Available on this site  
Evidence for an Extraterrestrial Impact R. B. Firestone et al, Evidence for an extraterrestrial impact 12,900 years
ago that contributed to the megafaunal extinctions
and the Younger Dryas cooling
Fyfield Down Leaflet Nature of the Sarsen stones
Groundwater Flood Scoping DEFRA Final Study (2004)
A303 Stonehenge Improvents Enquiry Discussion about the tunnel proposal
Journal of Cave and Karst Studies Some carbonate erosion rates of southeast Alaska
International Journal of Speleology Surface corrosion of an Alpine karren field: recent measures at Innerbergli
(Siebenhengste, Switzerland)
Materializing Stonehenge The Stonehenge Riverside Project and New Discoveries
   
General Interest  
wikipedia Free encylopedia
www.1911encyclopedia.org The original 1911 Encyclopedia Britannica
www.sacred-texts.com Sacred Text Archive
   
Official Web Sites  
www.english-heritage.org.uk/ Official web site
viewfinder.english-heritage.org.uk/ Photographs from the public archive of English Heritage
www.eng-h.gov.uk/stoneh/ Archaeometry and Stonehenge including results from the Ancient Monuments Laboratory
   
Media Sites  
news.bbc.co.uk/1/hi/sci/tech/ BBC News Science & Nature
www.britarch.ac.uk/ba/ba.html The Voice of Archaeology in Britain and Beyond
www.newscientist.com Science journal
www.pbs.org Public Broadcasting Service web site with archived transcripts of Secrets of Lost Empires: Stonehenge and Julian Richards' Q and A 
   
Unofficial Web Sites  
www.orionbeadling.net Stonehenge Avenue/Canal hypothesis
www.stonehenge-avebury.net/ Information about Stonehenge and neighboring sites
www.stonehenge.tv Bruce Bedlam's auditorium
henges.no.sapo.pt Henges - Engineering in Prehistory
   
Subject Related Web Sites  
myweb.tiscali.co.uk/celynog/ Comprehensive collection of megalithic sites in UK, France and beyond
www.shadowsandstone.com Stunning photographs of megaliths with commentaries
www.avebury-web.co.uk Beautifully designed web site about Avebury
www.gizagrid.com The Geometry of Ancient Sites
www.world-mysteries.com Up to date theories on everything
   
Unrelated Web Sites  
www.astrolabes.org Everything you need to know about the Astrolabe
www.autodidacts.f2s.com/astro/ Java based working online Astrolabes
www.davidmalin.com Stunning astronomical photography including images of the night sky reflected on water
www.dewponds.com All about Dewponds
www.geomancy.org Mid-Atlantic Geomancy
cura.free.fr/cura-en.html University Centre for Astrological Research
www.viewzone.com Lots of interesting stuff - really!
www.celticnz.co.nz Ancient Celtic web site
www.phantomvoyagers.com Indonesian Mariners' voyages to Africa and Madagascar.
www.brojon.org The ultimate conspiracy theorist!