The sixth may have been the tower in Helms Deep, the Hornburg.
I might be wrong but I think Dol Gulder was Sauron's fortress on top of a hill in Mirkwood.
*White Towers- contained a Palantir, West of the Shire
*Annuminas-contained a Palantir, North of the Shire
Does anybody know if Rhosgobel was a tower.
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