Gate of Time

The Gates of Time are objects from The Legend of Zelda: Skyward Sword. As their name suggests, Gates of Time are powerful magical gates that allows those who pass through it to travel through time. There are only two such Gates to be found: one at the Temple of Time, and another at the Sealed Temple.

Story
After Link completes the third dungeon, the Lanayru Mining Facility, he is able to pass through the facility to the Temple of Time in the Lanayru Desert, access to which had been blocked earlier. After a brief reunion with Zelda and Impa, Ghirahim attacks, forcing them to take drastic action and seek refuge within the Gate of Time, destroying it to ensure Ghirahim is unable to reach them there.

When Link returns to the Old Woman, she reveals that another Gate of Time is found in the Sealed Temple itself; however, activating the Gate of Time requires that Link infuse his Goddess Sword with three Sacred Flames of the Golden Goddesses. After he has done so, he is transported to the temple as it appeared in the present, when it was known as the Temple of Hylia. This Gate of Time is later used by other characters such as Groose and Ghirahim.