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- Bleak Falls Barrow after the main antechamber.
- Graywinter Watch has eleven skulls.
- Aretino Residence in Windhelm.
- The Midden underneath the College of Winterhold.
- The White Phial in Windhelm.
- Broken Helm Hollow has fifteen skulls.
- EldersBlood Peak has three skulls.
- Arcadia's Cauldron in Whiterun.
- Dustman's Cairn has two skulls.
- Random dungeon loot.
- The Ritual Stone, in the hole near the top of the stone itself.
- There are many in the Whiterun Catacombs.
- The main entrance (not secret entrance) to the Dawnstar Sanctuary.
- Jorrvaskr also has many skulls (though they will need to be stolen)
- 4 skulls can be found on the body of Lord Tusk, a unique Horker in the Dragonborn DLC.
- A unique bloody red skull with an ornate carved pattern can be found in the first room of Kolbjorn Barrow.
- Skulls can be aquired by looting various Halls of the Dead.
- An unusual unique skull with carved writings and runes can be sold for 50 gold occasionally by Belethor in Belethor's General Goods in Whiterun.