This is the first dungeon in Utgarde Keep. Located in the middle of Howling Fjord, this is a level 69-72 dungeon. There are four bosses, two of which are fought together: Prince Keleseth, Skarvald the Constructor and Dalronn the Controller, and Ingvar the Plunderer.
Just a short video showing how to get to the Tempest Keep instances from Area 52 in Netherstorm. From right to left, as shown in the video, the instances are The Mechanar (light purple), The Arcatraz (red), and The Botanica (light blue).
This video is for slouzero. Now you can find the entrance.
This is the second instance in the Caverns of Time. You must travel back in time to stop the Infinite Dragonflight from preventing the opening of the dark portal by Medivh. The Caverns of Time are located in the eastern part of Tanaris, but there is also a portal in Dalaran that will take you there.
This is a level 68-70 dungeon. You must defeat 18 waves of enemies, each spawning at 1 of 5 random locations in the dungeon. Waves 6, 12, and 18 are the three bosses Chrono Lord Deja, Temporus, and Aeonus. In order to enter the instance you must complete The Escape From Durnhold Keep instance first.