20. Vault of the Secret Formula
Pharmacist John S. Pemberton’s Coca-Cola formula, created in 1886, is regarded as one of the world’s most highly regarded trade secrets. The Coca-Cola firm moved it’s subsequently 125-year-old recipe from its original vault to the World of Coca-Cola.
Guests can visit the World of Coca-Cola after passing through a strict security checkpoint and may also see the Vault of the Secret Formula, but it’s merely a teaser. The vault stays closely guarded.
Though none have been officially supported a fast Internet search will lead one to many similar recipes.