Where are all the random dungeons?

Act I

Old Tristram Road

• The Cave Under the Well
• Damp Cellar
• Dank Cellar
• Mass Grave
• Musty Cellar

Old Tristram

• Dark Cellar
• Quality Well (Easter egg dungeon)

The Weeping Hollow

• Den of the Fallen

The Forsaken Cemetery

• Development Hell (Super rare Easter egg dungeon, Final Boss awards Feat of Strength)
• False Defiled Crypts

Fields of Misery

• Decaying Crypt
• House of Curios
• Lost Mine
• Scavenger's Den
• Tinker's Hovel (Sheltered Cottage)
• Pillaged Home (Sheltered Cottage)
• Farmer's Cellar

Southern Highlands

• Abandoned Servant House
• Cave of the Moon Clan
• The Lyceum
• Watch Tower (used to be in the Northern Highlands)

Leoric's Hunting Grounds

• Highlands Cave

Act II

Howling Plateau

• Abandoned Mineworks
• Fuad's Cellar
• Sirocco Caverns

Black Canyon Mines

• Blood Cellar
• Deserted Cellar
• Tunnels of the Rockworm (after defeating a unique rockworm inside a Deserted Cellar)

Stinging Winds

• The Crumbling Vault (and Vault Treasure Room; timed)
• Hadi's Claim Mine
• The Ruins
• Chamber of the Lost Idol
• Abandoned Cellar

Alcarnus

• Alcarnus Cellar
• Sandy Cellar
• Town Cellar

Dahlgur Oasis

• Ancient Cave
• Flooded Cave
• The Forgotten Ruins
• Mysterious Cave (available after saving Zaven the Alchemist)
• Old Fisherman's Cellar
• Ransacked Cellar
• Rotting Cellar
• Storage Cellar
• Storm Cellar
• Swampy Cellar
• Tomb of Khan Dakab
• Tomb of Sardar

Desolate Sands

• Cave of Burrowing Horror (after defeating a unique rockworm Shaitan the Broodmother)
• Vile Cavern
• The Veiled Treasure (Possibility of the Ancient Device)
• The Fowl Lair (after having used the Ancient Device)

Act III

The Arreat Gate

• Fortified Bunker
• The Barracks

The Battlefields

• Battlefield Stores
• The Foundry
• Cryder's Outpost
• The Forward Barracks

Fields of Slaughter

• Caverns of Frost
• Icefall Caves

Rakkis Crossing

• Bridge Stores
• The Underbridge

Act IV

Gardens of Hope 2nd Tier

• Blessed Chancel
• Holy Sanctum
• Radiant Chapel
• Sacellum of Virtue

Act V

Westmarch Commons

• Abandoned Cultist Stores
• Contested Villa
• Hall of Dark Arts
• House of Deep Sorrow
• House of Screams
• Invaded House
• Miser's Hovel
• Old Smugglers' Warehouse
• Plague Tunnels
• Sorcerer's Room
• Tustine's Brewery
• Wynton Courtyard

Westmarch Heights

• Alley of Embers
• Burning Courtyard
• Clyfton Hall
• House of Corpses
• Repository of Bones
• Vermin Alley

Paths of the Drowned

• Bogan Warren
• Caverns of Luray
• The Hunter's Den
• Perilous Cave
• Putrid Hovel
• Winding Cave
• Wretched Hole

Battlefields of Eternity

• Ancient Ruins of Dholmour
• Crumbling Bunker
• Hideout of the Lost Legion
• Infested Ruins
• Occupied Ruins
• Realm of the Banished