A windy place they say,
Atop the southernmost and tallest of the high
a place where an eye of seeing did lay,
First sought, then deserted as the years went by.
Thought to be "Amon Sul"
Weathertop, known in Sindarin as Amon Sûl, was the southernmost top of the Weather Hills. It stood a little away from the others, and its conical top was flattened.
Tolkien Gateway: Weathertop