It's Sunday, Y'all!
And inside the castle walls is this one area that includes this building and these stone markers or memorials. Not sure if this is a cemetery or a shrine.
Regardless, here is a hope...
"He will swallow up death forever; and the Lord GOD will wipe away tears from all faces, and the reproach of his people he will take away from all the earth, for the LORD has spoken." (Isaiah 25:8)
Soli Deo Gloria!