Every example uses the `places.js` script to load places. You set your places using static data, with specific coordinates, adding these info in the first lines of code (there are comments to explain it better).
Otherwise, as default, the script searches for places of interest near the user using Foursquare APIs. Please retrieve valid API credentials [here](https://developer.foursquare.com/) in order to use it. Place credentials (replace both Client Secret and Client Id) on `places.js`.
You can also use GeoAR.js **without** the script, adding `gps-entity-place` entities them directly on the `index.html` file.as documentated [here](https://github.com/jeromeetienne/AR.js/blob/location-based/aframe/README.md).