offers a "huge" amount of information! However it is a subscription site but it does offer a free 14 day trial.
You will definitely have to do some verifying of information. So much information has been added to family trees and just
copied and added to others without documentation. Archives.com - Census and vital records, Fold3.com - U.S. military records
and Newspapers.com - Historical newspapers; are now affiliated with Ancestry.com. They offer great resources. The only negatives to these sites is that you can easily get lost just reading through old newspapers or other records!
Findagrave.com is also a very good resource. You can find birth and death dates and sometimes photos of headstones or markers. When you find the cemetery you are searching for, type in the surname and it will bring up a list of everyone by that name. If you'd rater find a specific person, then just type in their first and last name. Often the site will have links to other family members even though they are in differnt cemeteries.
"What is Find A Grave? Find a Grave's mission is to find, record and present final disposition information from around the world as a virtual cemetery experience. Find a Grave memorials may contain rich content including pictures, biographies and more specific information. Members can leave remembrances via 'virtual flowers' on the memorials they visit, completing the virtual cemetery experience." (copied from Find a Grave's website)