Chess Capture Map: Using my games on Lichess.org, I wanted to see the squares where captures are most frequented. It was a good learning experience for combining Python and using the Plotly graphing library.
Ride Density Map: Before ridewithgps.com had its heatmaps, I wanted to create my own using Python.
Adventuring.world: Using Mapbox to show different places I have been and where I really want to go in the next few years. It was too good of a domain name to pass up.