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Alchemy & Classical Elements.

Much of the content in this category could also have been put under symbols, but their components differ in enough ways that I felt they deserved their own category.
 
 
Title: The Alchemy Website
Notes: The definitive alchemy resource. Contains detailed articles and information on every facet of alchemy and related subjects.
 
Title: Alchemical Symbol Index
Notes: A collection of alchemical symbols and what they mean.
 
Title: Wikipedia - Alchemical Symbols

 
Title: Elemental Correspondences and Associations
Notes: A large table of classical elements and their associations from a wide variety of subjects such as states of matter, animals, gods, compass points, etc.
 
Title: The Greek, Indian, & Chinese Elements
Notes: A detailed overview of the classical elements and their associations in Ancient Greek, Indian, and Chinese culture.
 
Title: Wikipedia - Classical Elements