The Wild Wild Web

OldMapsOnline is a free, open-access search portal that allows users to explore and discover historical maps from libraries and archives around the world. It brings together over 500,000 high-resolution scanned maps into a single, user-friendly interface, enabling users to search by location and time period without needing to know which institution holds the original map.

The historical tech tree is a project by Étienne Fortier-Dubois to visualize the entire history of technologies, inventions, and (some) discoveries, from prehistory to today. Unlike other visualizations of the sort, the tree emphasizes the connections between technologies: prerequisites, improvements, inspirations, and so on.