So the definition of cool is relative. But I think this book is cool: Stories in Stone: A field guide to cemetery symbolism and iconography.
I try to walk when I can, and last night I walked across the street from where I work. The church there has a cemetery. I don’t know if I would check this book out and then look at tombstones to see if there was symbolism on the stones, but I might.
In my college town, there was a tombstone maker. They were at a prominent crossroads and I always loved reading their sign that said “Drive Safely. We can wait.”