/r/InfrastructurePorn
High quality images of infrastructure.
This subreddit is exclusively for pictures of infrastructure. Paved roads and other public transit, agriculture, freight, waste management, and water systems are all things we could live without but we really don't want to (and they look cool too!). For some examples of infrastructure as well as a definition see this.
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Other subreddits you may enjoy:
/r/InfrastructurePorn
Light rail, heavy rail, a railroad switch house, water treatment facility (grey building far left), elevated highway, concrete production/silos, and some bridges.
The poised, lightweight elegance of this RPBW project is a masterful combination of engineering and design talent