Brohann Caskbelly in Stormwind wants you to search for the Temple of Atal'Hakkar.
There was a time when I was young and full of vigor like you, [class].
But now I'm old and unable to explore the world like I once did. Ah, the things I saw!
But there was one mystery that eluded me. For my final quest, the Explorers' League sent me in search of The Temple of Atal'Hakkar. It was rumored to be located in the Swamp of Sorrows.
Because of my frail state, I traveled the skies by gryphon in search of it but never found it.
Help an old dwarf out? Perhaps you will have better luck on foot.