You can learn much from reading the stones from at various eras in American history and get a good idea of what people thought was important to remember. It's also interesting to see trends such as different types of materials and styles of grave stones.
Sometimes I just stop at those little roadside cemeteries and have a look around. Many times places such as this are literally falling apart and quite neglected since ownership is in dispute. Sadly, sometimes it is due to vandalism.
Please have a look at a fine website dedicated to cemetery preservation in the state of Ohio by Linda Jean Limes Ellis.