Dungeon
This is a quick rundown and the zone classification of Dungeon. Dungeons can be indoors or outdoors. The reason why this is an important designation is mainly for the use of the Wand of Imperceptibility which drops rarely from a rare spawn in The Deep (#4 on the map). This is an unlimited charge self only shrink item. The only limitation is that it only works in zones classified as Dungeons. This works in most indoor zones where you'd want shrink from Luclin and previous. However, in PoP, its usefulness starts to diminish. Also note in the list below that Sanctus Seru, Kael Drakkal, Katta Castellum, and some others are classified as cities, not dungeons and thus not listed, and therefore the wand does not work in them. There is no other use of the Dungeon classification. If one is discovered, this will be updated.
Zones classified as Dungeons:
- Acrylia Caverns
- Akheva Ruins
- Befallen
- Blackburrow
- Castle Mistmoore
- Cazic-Thule
- Chardok
- City of Mist
- Crushbone
- Crypt of Decay)
- Crystal Caverns
- Dalnir
- Dragon Necropolis
- Estate of Unrest
- Fungus Grove
- Grieg's End
- Howling Stones
- Icewell Keep
- Kaesora
- Karnor's Castle
- Kedge Keep
- Kurn's Tower
- Lower Guk
- Mines of Nurga
- Nagafen's Lair (a.k.a. Sol B)
- Najena
- Permafrost Keep
- Plane of Hate
- Plane of Water
- Runnyeye Citadel
- Sebilis
- Siren's Grotto
- Sleeper's Tomb
- Solusek's Eye (a.k.a. Sol A)
- Splitpaw
- Ssraeshza Temple
- Temple of Droga
- Temple of Veeshan
- The Deep
- The Hole
- The Warrens
- Tower of Frozen Shadow
- Upper Guk
- Veeshan's Peak
- Velketor's Labyrinth
- Vex Thal
References: Solar's zone spreadsheet, Thread with more info