There is probably no greater collection of the bodies of saints, both known and unknown, than in Bunhill Fields in London. A brief mapping is located here. I hope to visit it in person one day, Lord willing.
Here is a succinct paragraph of description.
"To a lover of liberty of conscience, of freedom of thoughts, or an open Bible and of spiritual religion, it is, however, hallowed ground, for beneath its turf there are resting thousands of brave men and women who counted not their lives dear unto them, but who 'contended earnestly for the faith once delivered to the saints.' The principles of Scriptural Dissent are here magnified, whilst thoughts of cruel and wicked persecutions by spiritually ignorant clerics, magistrates, and evil princes crowd into the mind. Here are buried some 120,000 persons. Many of these died in poverty and distress, some even within prison walls, whilst had they been willing to comply with the regulations and to accept blindly the teachings of such popish bishops as Laud, many would have occupied positions of national distinction." (Alfred W, Light)