General reference
Curious books
- Laberinto Ermetico: Mutus Liber
- Codex Seraphinianus
- Dictionnaire Infernal
- Codex Gigas
Medieval studies
- The Labyrinth
- Gode Cookery
- British Library: Medieval manuscripts blog
The calendar
Ancient medicine
- Kheper: The Four Humours
Pop culture
- Zoso – Jimmy Page’s Symbol From the Led Zeppelin IV Album