Espionage is one of the core concepts in Civilization IV: Beyond the Sword. The following buildings produce or accelerate the production of the espionage resource:
- Castle
- Intelligence Agency
- Jail
- Mausoleum
- Sacrificial Altar
- Scotland Yard
- Security Bureau
- Courthouse
- Palace
In addition, the Spy specialist and Great Spy (when used as a specialist) also produce espionage.
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