Attics and Basements...

https://en.wikipedia.org/wiki/Basement#Types_of_basement

http://browseinside.harpercollins.ca/index.aspx?isbn13=9781554680313

http://datab.us/i/basements

http://hostedmedia.reimanpub.com/TFH/Step-By-Step/FH00MAY_STORMS_05.JPG/
http://www.familyhandyman.com/smart-homeowner/how-to-build-a-storm-shelter/view-all

http://usatoday30.usatoday.com/weather/resources/safety/saferoom.htm

https://jf-databits.blogspot.com/search?q=basements