Hokage Rock

The is a mountain overlooking Konohagakure that has all the faces of the Hokage carved into the stone. It was envisioned by Hashirama Senju as a symbol that the Hokage would always watch over the village. The Hokage Rock is easily the most identifiable feature in the village, such that when the village is destroyed during Pain's Assault, only the presence of the Hokage Rock (undamaged by the destruction) confirms to others that the rubble was once Konoha. Being such an icon makes it a prime target for pranks, with both Naruto Uzumaki and, years later, Boruto Uzumaki defacing it in order to gain attention.

Adding a Hokage's face to the monument apparently takes time, as the Fifth Hokage's face is not added until some time during the timeskip (in the anime, it is added by episode 187 of the original anime). The anime suggests it doesn't actually take too long, as the Stone Carver adds first Danzō Shimura's face and then Kakashi Hatake's face to the monument prematurely, in turn forcing him to remove their faces once they are not officially given the position. Similarly, faces can be added to the monument before a Hokage officially takes office, as the Sixth Hokage's face is added to the Hokage Rock before he agrees to accept the responsibilities of the office.

For the first few decades of the village's history, the Hokage Rock is left mostly untouched, being used only to house the village's archives and protect its villagers during times of attack. In the years since the Fourth Shinobi World War, Konoha has expanded to the plateau above the monument, with the village's new skyscrapers seen towering above it. Some time later, the Hokage Rock was largely damaged.

Trivia

 * The monument is similar to Mount Rushmore, which features sculptures of the heads of four United States presidents.
 * Despite the increasing number of faces, the Hokage's office is always right in the middle underneath them, suggesting they can be moved with Earth Release.
 * During the Konoha Crush, the Third Hokage's face cracks, giving those who see it a bad omen. The damage is apparently later repaired.
 * The Fourth Hokage seems to have marked his head on the monument for the Flying Thunder God Technique, as he teleports to its location on two separate occasions.
 * In the episode "The Appearance of Strange Visitors", the stone faces were shown to make disgusted grimaces and the monument of the Fourth holding his nose, when Naruto spilled a whole barrel of manure on the wannabe-spies Mondai and Potcha in what he thought to be taijutsu training.
 * In the episode "The Directive to Take the Nine-Tails", when Tsunade demanded that Naruto is not to return to the village until he can defeat the so-called "Mecha-Naruto", the stone faces were shown to make flabbergasted face faults.
 * In the early episodes of the anime, the Fourth Hokage's hair is depicted as flat. This is corrected in later episodes of Shippūden. Similarly, the Sixth Hokage was depicted with a forehead protector in chapter 699, but without one in The Last: Naruto the Movie.
 * The Seventh Hokage's face is actually what Naruto looked like in his teen years, and not his adult appearance when he actually became Hokage. This could be either be by choice on Naruto's part, or the skuplter chose his teenage look due to it being when Naruto was most famous. Obito's dream sequence of how he could have returned to Konoha and became Hokage backs this up, as Obito's scarred visage was used instead of his pre-accident look.
 * Should a Hokage wish it, a specific item can go on their stone face, as Kakashi's has his mask. Obito even stated he would want his stone face to have his sharigan and goggles, despite it being pointed out how silly it would look.
 * In episode 114 of Boruto: Naruto Next Generations, Iwabee Yuino and Metal Lee add Shino Aburame's and Rock Lee's faces to the Hokage Rock in an attempt to raise their profile so they'll be added to collectable cards.
 * If the faces are damaged, Academy students can be punished to help repair them. Though this turned out disastrous for Boruto's class due to Metal Lee getting carried away and further damaging Lord Seventh's stone face.