A few of the old broken tombstones at the Trinity Episcopal Cathedral located in downtown Pittsburgh. I decided to keep them simple with a straightforward black and white conversion.
Nothing fancy today.
© David Guidas
© David Guidas
© David Guidas
© David Guidas
What I Pic 
are they on the ground as a monument?
It is, or was, an actual burial ground and I think there is some type of historical renovation going on. The stones are just flat slabs so I doubt if they were ever standing. According to the website:
October 1787 — Land given by heirs of William Penn. Recorded in Westmoreland County, the ground was originally used by Native Americans, the French at Fort Duquesne, and British at Fort Pitt, as a burial ground. Three lots were included in deeds to the Episcopal and Presbyterian churches, including a burying ground (1.5 lots given to each group). There were originally 4,000 graves, and over 2,000 have been identified. Although the deed does not name Trinity, the trustees chosen to receive the land were the ones who were active in the creation of Trinity. John Ormsby, one of the trustees, had been recorded as a lay reader at Fort Pitt as early as 1762.
and
2006 — Burial Ground renovations will begin in the summer of 2006 with surveying and finalization of design plans, with the hope of beginning stone removal, demolition, and regrading by October.