I always was interested whether the number of Kebab restaurants in my town (which is huge, you'll understand the assumtion after take a walk in the center of the city). I grabbed GMAPs Places API, queried various places and did some calculations on number of Kebab restaurants nearby (i.e. 100m, 500m, etc.).
Here one result:
See the notebooks for details. Run getter.ipynb to generate data.
The plot is generated in Density.ipynb.