Based on your questions, it sounds like you might not have a clear understanding of what 529 plans are or how they work.
If this is the case, you can visit this page, and read up on them.
To supplement @dcandmc, you can find a list of eligible institutions here: http://www.savingforcollege.com/eligible_institutions/
If you make a withdrawal from a 529 savings plan for expenses at these schools, the withdrawals will be tax-free.
Also note that prepaid plans may have unique restrictions on what schools are eligible, and varying values for your savings by institution. There is also the Private College 529 Plan, which works a bit like a prepaid plan with participating institutions.
These plans can be quite complicated, but I'm happy to help explain further if this muddies the waters for you, @Hadeel!
Brian Boswell VP, Research & Development
This information does not constitute tax advice and is provided for informational purposes only. Please consult your tax advisor, financial advisor, local taxing authority, and/or plan provider or sponsor for more information.