Pyre

A pyre is a structure, usually a mound of stones, for burning a body as part of a funeral rite.

Minas Tirith has many pyres made of stone in it's hallows and one of them was used to burn Denethor II alive and the seemingly-dead Faramir under Denethor's orders, during the Battle of the Pelennor Fields in 3019. When Peregrin Took, that worked for Denethor, knew what his master was about to do, he runs into the battle to find Gandalf, and when they arrives, they save Faramir, but Denethor perishes in the pyre. In the movie, a flaming Denethor runs out of the pyre leaps of the rock prow of Minas Tirith during the siege, obviously falling to his death.