At the heart of Croxden

After his death in 1216, King John's body was carried cross-country for burial from Notingham (where else?!) to Worcester Cathedral via Staffordshire, where his heart was supposedly left, en route, with the monks at Croxden Abbey in the moorlands here. 

(The bits and pieces of royals were regularly extracted from their corpses before burial and distributed. I am not sure why this practice ocurred...)

However, Croxton Abbey (you can see how the confusion arises...) in Leicestershire also claims to be the burial place of the heart.  The various commentators get in quite a spat about it.

Unfortunately Croxden was largely dismantled following Henry VIII's destruction of the monsteries, and is now a ruin as you can see.  So if there was a marker giving proof that this is where John's heart was interred, it was no doubt expropriated or broken up about that time.

But we know for sure that John did not leave his heart in San Francisco.