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 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. 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
- Cazic-Thule
- Howling Stones
- Chardok
- City of Mist
- Crypt of Decay)
- Crushbone
- Crystal Caverns
- Dalnir
- Temple of Droga
- Tower of Frozen Shadow
- Fungus Grove
- Grieg's End
- Lower Guk
- Upper Guk
- Plane of Hate
- The Hole
- Kaesora
- Karnor's Castle
- Kedge Keep
- Kurn's Tower
- Castle Mistmoore
- Najena
- Dragon Necropolis
- Mines of Nurga
- Splitpaw
- Permafrost Keep
- Plane of Water
- Runnyeye Citadel
- Sebilis
- Siren's Grotto
- Sleeper's Tomb
- Solusek's Eye (a.k.a. Sol A)
- Nagafen's Lair (a.k.a. Sol B)
- Ssraeshza Temple
- Temple of Veeshan
- The Deep
- Icewell Keep
- The Estate of Unrest
- Veeshan's Peak
- Velketor's Labyrinth
- Vex Thal
- The Warrens
References: Solar's zone spreadsheet, Thread with more info