In my searches on the internet i often stumble across info that is new to me and might be useful to other in the prepping community

One of these such items is the catalan vault

 http://en.wikipedia.org/wiki/Catalan_vault 

the catalan vault is a really great idea and can be manufactured with limited resources, is very solid and can provide very stong buildings.

 http://architecture.mit.edu/class/guastavino/features/ramage/index-ramage.htm#

http://block.arch.ethz.ch/

the tiles used in the vault can be simple clay dried in the sun . and can be stuck together with a simple plaster –

http://www.notechmagazine.com/2011/12/sustainable-urban-dwelling-unit-sudu.html

check out some of these links for more info