Lantern Cavern

Lantern Caverns are numerous pseudo-dungeons scattered about the Hyrulean landscape in Twilight Princess. After using a Bomb or Bomb Arrow on a cracked depression in an otherwise normal rock face, these caverns will reveal themselves. They are likely to contain Poe Souls, Pieces of Heart, and large amounts of Rupees, considering their expansive size and dank innards. While Link can navigate some portions of such caverns without a light source, the growing darkness, enemies such as Poes and Rats that creep in the shadows, and obstacles such as large, flammable spider webs all work against Link, impeding his progress and eventually requiring the use of the Lantern for navigation. The largest of the Lantern Caverns is located on Lake Hylia, and it is the only one to provide a portal halfway through that will send Link back to it's entrance, if he steps into its light. As with dungeons, however, there is only one entrance, and thus upon reaching the end of the cavern, Link must backtrack to return to the mainland.