Dunharrow

Such was the dark Dunharrow, the work of long-forgotten men. Their name was lost and no song or legend remembered it. For what purpose they had made this place, as a town or secret temple or a tomb of kings, none in Rohan could say. Here they laboured in the Dark Years, before ever a ship came to the western shores, or Gondor of the Dúnedain was built; and now they had vanished, and only the old Púkel-men were left, still sitting at the turnings of the road.
– The Return of the King (Book 5), Chapter 3

The ancient refuge of Dunharrow is an upland at the feet of the White Mountains. It can only been accessed through the Stair of the Hold which climbs along one of the vast cliffs of the mountain range. Located south of the Rohirrim capital of Edoras, it serves as an important defensive position in times of war.

Dunharrow’s origins are unknown, but it predates the founding of the Realms in Exile, having been erected sometime in the Second Age. It was most likely constructed by those whose remains dwell in the Paths of the Dead which lie just beyond the Dark Door, the entry into their realm.