COLOSSEUM: Its presence makes 3 unhappy people content. It costs
100 resources to build, and requires $4 per turn to maintain.

COURTHOUSE: This improvement reduces corruption in a city by
50%. It costs 80 resources and needs $1 per turn to maintain.

FACTORY: A Factory increases the amount of resources generated
by a city by 50%. They become obsolete and stop working if a
Manufacturing Plant is built in the same city. It costs 200
resources to build and requires $4 per turn to maintain. The
effect of a Factory may be increased by the presence of a Hydro
Plant, a Nuclear Plant, or a Power Plant. It may also be
increased by the Hoover Dam, a modern Wonder of the World.

GRANARY: Cities possessing a Granary use up only 50% of their
stored food to create new population. The storage box only half
empties. In addition, the Granary prevents a Famine disaster
from destroying population. The Granary requires 60 resources to
build and $1 per turn to maintain.

HYDRO PLANT: The production bonus for a Factory or Manufacturing
Plant is doubled of the city has a Hydro Plant. In addition, a
Hydro Plant reduces the probability of pollution. A Hydro Plant
may only be built by a city on or near a River, Hills, or
Mountains. It costs 240 resources and requires $4 per turn to
maintain.

LIBRARY: A Library increases the knowledge production of a city
by 50%. It costs 80 resources to build, and costs $1 per turn to
maintain. The effect of all Libraries in your cities is
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