Mulgore Hot Springs
Near the windswept plains of Mulgore, there is a series of hot springs that house a ley line pattern. These hot springs have strange healing powers, allowing those who rest in them to heal at double their normal rate.
In Warcraft III you could see steam vents located all around norther Mulgore, near some of these vents was a pool of water. Perhaps that was one of the hot springs. There was also a Fountain of Mana near a village in the north which could be one of the hot springs.
While taking a flight path from Thunder Bluff to Orgrimmar, one can see a cave and a hut. Though these places are not accessible by normal means, determined explorers who have reached the area say that the cave is shaped like an "S" with a chamber at the end and areas where water could be added in the future. The hut and area is overgrown, with no spots of interest.