Things of Middle-earth
Great White Pillar of Umbar
A monument to Sauron's purported defeat by the last King of Númenor, Ar-Pharazôn:
The loss of Umbar was grievous to Gondor,... because it was there that Ar-Pharazôn the Golden, last King of Númenor, had landed and humbled the might of Sauron. Though great evil had come after, even the followers of Elendil remembered with pride the coming of the great host of Ar-Pharazôn out of the deeps of the Sea; and on the highest hill of the headland above the Haven they had set a great white pillar as a monument. It was crowned with a globe of crystal that took the rays of the Sun and of the Moon and shone like a bright star that could be seen in clear weather even on the coasts of Gondor or far out upon the western sea. So it stood, until after the second arising of Sauron,... Umbar fell under the domination of his servants, and the memorial of his humiliation was thrown down.
The Lord of the Rings, Appendix A, Annals of the Kings and Rulers: Gondor and the Heirs of Anárion
Elena Tiriel 5Sep11