Hokage Rock

The Hokage Monument, or Hokage Mountain, is the most representative trait of the Village Hidden in the Leaves. It is a Mountain that has carved into the stone the faces of all the Hokage so far. During the first episode, Naruto Uzumaki painted the faces of the 4 Hokages as a joke, and revealed that he planned to surpass them, stating that his face will too be in the monument. At the beginning of the series, the Monument had the faces of the First Hokage, the Second Hokage, the Third Hokage, and The Fourth Hokage. During the timeskip, the face of the Fifth Hokage was added to the mountain and Naruto finds out in the first episode of Naruto Shippuden.

The Monument has been important during many parts of the story, mostly because of its symbolism. During Orochimaru's attack to Konoha, The Third Hokage's face cracked, giving a bad omen. During the Konoha 11 filler arc, the climax occurs at the Hokage Monument, simbolizing that the future of the village is safe in the hands of the genin. During Pain's Invasion to Konoha, after using Shinra Tensei, most of the village was destroyed, but the Hokage Monument endured the gravitational attack. After watching the Hokage Monument standing next to a wasteland, Naruto realized after coming back, that Konoha had been destroyed.

Trivia
The first episode of Naruto Shippuden dedicated the Omake to the Hokage Monument and the 5 faces it currently has.