Two islands exist on Azeroth - one in Kalimdor and one in the Eastern Kingdoms.
The first, far to the northwest of Kalimdor, is identical to the second. A secluded island with an uninhabited manor beside a large mountain.
Thanks to phase-jumping and some clever thinking by Dashade, the inhabitants of the realm have discovered two chambers inside the mountain with no discernible entry or exit.
Although it's known that Vir was pulled through time via phases, it's assumed that whatever the chambers hold hasn't been built yet, or that, if it has been built, it only exists in another phase... or something else entirely.