Tile improvement (Civ4)

A tile improvement is a modification to a base tile which typically increases its production and may also unlock a resource if the tile has one. Land tile improvements are made by Workers; Work Boats are required to improve water tiles. Generally players call tile improvements just improvements, since other kinds of improvement have distinct and more particular labels. However, you may sometimes see buildings referred to as "city improvements."
==List of Tile Improvements==
This is a list of all tile improvements:
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The following improvements unlock resources on a tile. Many of them serve a purpose without a resource, while others' sole job is to unlock resources:
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Category:Game concepts (Civ4)
Category:Improvement lists