Auroville (City of Dawn) is an "experimental" township in Viluppuram district in the state of Tamil Nadu, India near Puducherry in South India. It was founded in 1968 by Mirra Richard (since her definitive settling in India called "(The) Mother") and designed by architect Roger Anger. 
Auroville is meant to be a universal town where men and women of all countries are able to live in peace and progressive harmony, above all creeds, all politics and all nationalities. The purpose of Auroville is to realize human unity. 
"Another religious community that has impressed with their sophistication is Auroville in southern India. (http://www.auroville.com/ This site used to be more about the community but had since gone more commercial, the community info apparently moved to auroville.org but the site down at the moment.
However, the Auroville Earth Institute page has a good overview of the community architecture) I learned of them through my study of earth block architecture for use in non-toxic MCS-adaptive housing. They have produced some of the most sophisticated earthen architecture in the world and developed what I think is the most advanced form of Cinva Ram ever created; the Auram 3000. They may even hold the world record for the largest span earth block vaults and domes ever built and the largest solar oven kitchen. Unlike other religious communities, they are very public and involved in a broad spectrum of industries."