Trial Gate

Trial Gates are objects from The Legend of Zelda: Skyward Sword. Magical portals leading to the Silent Realms, they are invisible to anyone but the chosen hero. In order to find them, Link can use the Goddess Sword's dowsing ability; when Link is in the proper location, a sparkle of faint light is found hanging over a Trial Gate spot.

Story
In order to activate a trial gate, Link must use the Goddess's Harp to play a song, different for every location: "Farore's Courage" in Faron Woods, "Nayru's Wisdom" in the Lanayru Sand Sea, and "Din's Power" in the Eldin Volcano. When a song has been played, Link must embed his sword into the ground, transporting him to the Silent Realm.