For those that haven't stumbled upon this tremendous resource, Find A Grave contains (at present) 82 million grave records, many of which are accompanied by tombstone photos. This is an excellent site for beginner genealogist to find important data and leads, as well as wonderful photos for your family history archive.
Find A Grave can be searched by name, birth date, death date and cemetery location. You can also look up a specific cemetery and search it all of the surnames you have associated with that location; a great way to discover information about aunts, uncles, cousins and extended family.
Some entries contain very little information at Find A Grave, but there are some that contain a great deal of historical data, such as my ancestor Isaac Low's Find A Grave page.
The images and data are submitted by volunteers, and if you know the cemetery where your ancestor is buried, you can submit a photo request. If you live near a cemetery, you can find requests for photos and pitch in to help others.
FindAGrave.com is a free service, supported by ads and sponsored pages (to remove ads). To place or fulfill photo requests, a free member account is required.
If you have found something awesome and unexpected at Find A Grave, feel free share your find in the comments below. We love to hear about genealogy success stories.