Tower of the Gods
The Tower of the Gods is a hidden location in The Legend of Zelda: The Wind Waker. Once Link retrieves the three spiritual pearls, he must place them at the triangle islands. When this is complete, the massive tower arises from the sea. Once inside, Link must fight through a multitude of enemies and solve various puzzles.
He will eventually learn the Command Melody and find the Bow. The boss of the tower is Gohdan, a disembodied figure with a head and two hands. Once the boss is defeated, Link is teleported to highest part of the tower, and is commanded to ring the bell, which reveals a portal to Hyrule's past, outside the Tower.