Ancient Castle of Ikana

In Majora's Mask, the Ancient Castle of Ikana is located deep in Ikana Canyon, and is home to the long dead king of the Ikana kingdom, Igos du Ikana. The Castle is the center of the once-great kingdom of Ikana. When the Garo Ninjas moved in nearby, however, the Garos infiltrated the fort and brought the kingdom to its knees.

The main entrance of the Castle of Ikana is sealed up and cannot be entered normally. Therefore, Link has to find an entrance somewhere else. The two accessible entrances are:
 * After obtaining the Mirror Shield from Beneath the Well, there is a small cave that is connected to the courtyard of the castle.
 * The other entrance can only be used once the Mirror Shield or the Light Arrows have been obtained. It is a small opening next to the main gate and can be opened by removing the Sun block, by either reflecting sunlight on it or shooting it with a Light Arrow.

The castle is an ancient building that is home to countless undead enemies, especially ReDeads and Wallmasters. Once Link reaches the end of the castle, he will encounter Igos du Ikana and his two minions. After successfully defeating them using the Mirror Shield and the Fire Arrows, the King teaches Link the Elegy of Emptiness, which is necessary to advance once inside the Stone Tower.

Trivia

 * The ReDeads inside the ruins react to the Gibdo Mask, Garo's Mask, Kamaro's Mask or the Captain's Hat. They start dancing as soon as Link dons one of these masks and are unable to hurt Link, even after being attacked.
 * By throwing a Powder Keg off a fence on the roof, it is possible to skip half the dungeon and a Wizrobe battle.