This plugin generates a grid of points over a specified area and returns the coordinates of the intersecting points within the grid.
You can customize the grid by providing a center position (latitude and longitude), a distance (kilometers or miles) and a density value to control the grid size.

The resulting list of coordinates can be used for wide area searches, such as feeding them into the Google Places API request to retrieve more than the capped 60 results that you get through pagination.

The demo page shows a visual representation of how this works, with each intersecting point marked on the map so you can see how the grid looks.