The Night Elves as a people withdrew from Kalimdor and everywhere else following the Sundering to focus their attentions on Hyjal, with only a handful of Night Elves remaining in very small population centers outside of the slopes of Hyjal surrounding Nordrassil (e.g. the Broken Isles and Eldre'Thalas). It stands to reason that the majority of Kaldorei temples devoted to Elune probably fell into ruin or were gradually repurposed without any active use by Elune's priesthood over the ages during the Long Vigil. Ancient Kaldorei ruins do dot the lands across Azeroth, of course, like in Feralas, Desolace, and even the Hinterlands in the Eastern Kingdoms - but all of these ancient edifices are generally unpopulated and serve no active purpose, where they're not just heaps of white marble dotting the land.
The only known active Kaldorei temples to Elune that have remained intact to the current day are the ones in Val'sharah, Suramar City, and previously the main temple in Teldrassil prior to its destruction. Ruined temples to Elune include Fal'adora in northern Suramar, the ruins of Elun'alor in Nazjatar, the ruin of Quel'Dormir temple in Vashj'ir, and Zin-Malor in Eldarath (Azshara).