Town Watch is a Technology that is researched at the Town Center. It increases the line of sight for all buildings by +4. This technology can come very handy in the Feudal Age to upgrade the line of sight to all Outposts.
The Byzantines receive Town Watch for free as part of their civilization bonus.
History
Each town and community was responsible for its own defense for much of the Middle Ages, relying on the local lord and his retinue of soldiers for protection. The danger from bandits, raiders, or unfriendly neighbors was real. Communities developed a town watch that scouted the nearby countryside regularly. The town watch reported danger to give the community time to prepare what defense it could.
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Town Watch in Age of Empires III is an improvement found at the Church