AQUEDUCT: Cities without an Aqueduct may not grow beyond a size
of 10 population points. In addition, Aqueducts prevent the
disasters of Fire and Plague. Aqueducts require the advance of
Construction, cost 120 resources to build, and cost $2 per turn
to maintain.

BANK: Banks increase the luxuries and taxes generated by a city
by 50%. Banks cost 120 resources to build and $3 per turn to
maintain.

BARRACKS: New units built in this city are already veterans,
increasing their attack and defense factors by 50%. Barracks
prevent the disaster of pirates. They disappear when you acquire
the advances of Gunpowder and Combustion. SECOND generation
Barracks cost $1 per turn and third generation Barracks cost $2
to maintain per turn.

CATHEDRAL: A Cathedral makes four unhappy people content and is
very useful for keeping a large city out of civil disorder. It
costs 160 resources to build, and takes $3 to maintain per turn.

CITY WALLS: City walls triple the strength of a defending unit,
except when attacked by a Bomber or Artillery unit. This
tripling occurs after considering the effect of terrain and
veteran status. Cities defended by City Walls do not suffer
population losses when a defending unit it destroyed. Walls also
prevent the disaster of Flood. They cost 120 resources and
requires $2 per turn to maintain.

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