Abandoned Uchiha Stronghold.
The abandoned Uchiha stronghold was a former base of the Uchiha clan, which ceased being used after the Uchiha clan massacre. It was set atop a mountain that was in turn surrounded by forest. The only room that is seen seems to be a sort of throne room that has numerous indentations in its walls. Behind the throne is a poster that depicts the kanji 狐 (kitsune, literally meaning: fox) surrounded by eight swirls.
The fortress became the site of the final battle between Sasuke Uchiha and Itachi Uchiha eight years after the massacre. It suffered massive damage from the various fireballs launched by the two brothers, and the entire building was eventually blown apart by Sasuke's Kirin. The forest around the area was also set ablaze by Itachi's Amaterasu.