From Wikipedia: Public Works

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Public works are a broad category of infrastructure projects, financed and constructed by the government, for recreational, employment, and health and safety uses in the greater community. They include public buildings (municipal buildings, schools, and hospitals), transport infrastructure (roads, railroads, bridges, pipelines, canals, ports, and airports), public spaces (public squares, parks, and beaches), public services (water supply and treatment, sewage treatment, electrical grid, and dams), and other, usually long-term, physical assets and facilities. Though often interchangeable with public infrastructure and public capital, public works does not necessarily carry an economic component, thereby being a broader term.

Here's a list of the separate categories:

municipal buildings
schools
hospitals
transport infrastructure
roads
railroads
bridges
pipelines
canals,
ports
airports
public spaces
public squares
parks
beaches
water supply
treatment
sewage treatment
electrical grid
dams