People are fascinated by how cities evolve, but existing visualizations lack interactivity and detail. A dynamic timeline could show growth year by year.
Build a web app that lets users explore city development interactively. Include layers for buildings, infrastructure, and population data.
Urban planners, historians, and enthusiasts would pay for detailed insights. Schools and museums might also license the tool.
Start with a single city like Los Angeles, then expand to others.
The risk is high data collection costs and niche audience appeal.